PS we'll be looking at a 30".

I think the issue is that the Electrolux slide-in was an early induction range (maybe March 2010), followed by the other brands you mention. When I ordered mine in June 2010, the competition was a Viking (at twice the cost), the Samsung had just come out, and maybe that Kenmore. [Not clear who makes Kenmore; it may be a different version of the E'lux range (or one of the others).] In particular, the GE induction is quite new and may not yet be shipping -- I haven't seen anyone here comment on having it (or even having seen it, IRL). [FWIW, I'm happy with my E'lux range -- search the bottom of the page for other posts, here.]

The E'lux does blow warm air softly out the front (above upper oven door); its quiet, and not at all bothersome. A convection oven is likely to be noisier than that, fer sure.

There is some clicking, but its not loud or bad. Best to visit an appliance store that sells these ranges; bring your (magnetic) pans, so you'll have a better idea of what this will be like.

Good luck; I think you'll like induction. But: one of the reasons some people prefer gas is if their electrical power often goes out (like from falling trees, etc.); so that may be an issue to consider.

How about Kenmore? I am 95% satisfied with my Kenmore induction slide-in...

I believe the Kenmore is made by Electrolux..

NaRo: I keep hearing about noise from pots and pans, but I'm wondering what kind of noise we're talking about.

Whether there is any noise, and its nature, is determined by the specific pot. We have one pot that is prone to whistling; it is a Demeyere Apollo saucepan. We have other Demeyere Apollo cookware that never whistles, and the specific pot that does make noise does so only under certain circumstances, such as the level of the liquid inside the pot. Very occasionally, other pots have briefly whistled, but such occurrences are few and far between.

On the basis of a dozen years' experience with induction, I am confident of these conclusions:

o -The noise is a harmonic resonance between the
pot and the frequency that the magnetic field is
oscillating;

o -A pot that has a disk fused to the bottom of
the body is more likely to resonate than a pot
that lacks a disk bottom;

o -The contents of a pot affect whether a pot
will resonate.

As for the nature of the sound, it is a (usually) higher pitched version of the "singing" that you sometimes can hear from electric power transmission lines outdoors.

The GE freestanding has been around a while, the slide-in is fairly new.

The Elux slide-in has been around a while, the freestanding is fairly new. The freestanding has a porcelain top rather than stainless which costs less.

I think the Frigidaire is a hybrid unit, two induction hobs and two radiant.

I personally don't like the layout of the Samsung.

Responding to OP questions in this and my E'lux induction review thread: yes, it does blow air. I would not say it is hot air, but warmer than room temperature. I live in Ontario, and currently it's 4*C (~40*F) today. If it blows on me I am more than happy today!
Seriously, I don't find it uncomfortable. The fan does run for a while (I've noticed up to an hour?) after the oven turns off; for a shorter time after the cooktop turns off. I used to open my old oven to let the warm air warm the house... but I've read with this range that the fan running is important for cooling the electronics.
I would still recommend this range: clean up is a breeze, and the cooktop still looks gorgeous and new after buffing it with the cleaner once a week. That being said, I'm not a "fancy" cook and don't shake my pans around... if I did I would be afraid of scratching it (however people do recommend parchment paper underneath for that). All my former review still holds true tho': fast water boiling and very even, responsive heat.

The GE Profile slide-in is model PHS925STSS. It's been on their site for a couple months, but none of my local stores have it on display yet.

I looked through the exploded parts diagrams on the GE Support site, and there is a blower that evacuates warm air that is under the induction top out of the back vents (it looks like a stainless bar with vent openings).
It is my understanding that all induction ranges have a blower to keep the induction parts cool under the cook-top.
I'd prefer this warm air to vent near the back of the unit away from me (like on the GE slide-in) than near the front of the unit like the Electrolux.

Here is a link that might be useful: GE PHS925STSS

I am planning to order the Wolf 36 inch induction. I looked at almost every brand and variety and it came down to a few choices. JennAire - new 5000W super burner and 2 bridge units, Miele, Elux, and Wolf. I went with the Wolf as I liked the configuration and the finish and on sale so not as bad as the usual.
If I had all the money in the world - I would snag the Gaggenau with the entire surface induction - but more than I would spend on all appliances combined!
Back when I get the Wolf installed and running (kitchen remodel)
I tested induction with a portable unit for the past year before making my decision on going induction.

I took another look at the parts diagram for the GE PHS925STSS slide-in induction, and it looks like it comes with the black side panels installed from the factory (#221). Most other electric or gas slide-in ranges (including GE and Electrolux) don't have panels on the side, but are available to buy and install as an option. Again, this would be something to verify once stores have it on display.

Here is the cooling fan (#33) that is located under the induction cooktop. The vents for it are at the rear (#12).