I don't know but I am "bumping" you for those who do!

Post form counters will need to be cut to size and finished on the ends. They come from big manufacturers (mostly) in 8', 10', and 12' lengths. Most are going to be 1.5" at the face edge, you can either build up the rest of the top with 3/4" material to make them 1.5", or you can let the front edge lip the cabinets.
Around here, lowe's stocks a couple post form tops that are 1 3/8" at the front edge. Usually with an ogee type edge. My supplier only does 1.5"
Other wise, there are 5 to 8 different front edge options with post form, and almost all can be ordered in just 'deck' form, meaning no built on backsplash.

The difference between square and ideal is they way the edge material is applied and the type of adhesive it's applied with. I believe Ideal is 1.25", where square edge could be any thickness you wanted it to be, because you have to build the substrate to apply the laminate to.

How they hold up will depend on how you take care of them. Water is what will destroy the substrate and your tops.

Post form will have miter seams (typically) if you have 90/45 degree turns. With Ideal and Square since you are building the top you can usually get the seams out of the corner since sheet goods will typically be available in 5'x12' sheets.

With Post form you will have brown lines on the ends where the end caps are applied. With Square you will typically have the brown line around the whole top where the top sheet meets the edge. With Ideal you shouldn't have any brown lines.

OP is planning to get Jet Sequoia Formica--with a dark colored formica like that, the brown lines are pretty much a non-factor.

Thanks so much for the information I really appreciate it.

All of our big box stores around here stock the ogee edge for the 180fx, then you have to apply the end caps.

You have to cut them to fit, then apply the end caps, and build ups, a sink hole...

If you go that route, look around for a local shop. As an example I stock 15 or so colors on different edges, priced under the big box stores in the area. So before you buy at the blue or orange stores, look for a local shop that can provide not only the top, but the service, support, and advice to make replacing your counter tops easier and cheaper.

We were set on Formica 180FX and got estimates for our kitchen at our last house. After everything the price was much more than I had expected. I went to a granite fabricator and got estimates, and found that the granite was only going to cost us $500 more. We ended up with granite & never looked back.

"Also is this available only 1.5 inch thickness or could you do a 3cm thickness?"

3cm translates to about 1 1/4". A skilled fabricator could rip 1/4" off the edges of you 1 1/2" tops before installation.

Laminate is a great budget choice! If you order the blanks and DIY the cutting and installation yourself, or you choose a basic color to have fabricated for you. When you want the upgraded colors and edges, the price starts to creep upwards to not much difference between it and stone.

I DIY installed this Formica 180FX counter/sink/faucet display in our showroom. We ordered it cut to size, with the sink hole already cut, so it was a hybrid between complete DIY and Do It For Me approaches. The more you can DIY, the lower the price can be.

Coffee, Tea, and Marble, on a budget! · More Info

Coffee, Tea, and Marble on a Budget by Aristokraft · More Info

^^of course that depends on the type of top and edge profile. More importantly, ripping off a 1/4" really would serve no purpose.

"...ripping off a 1/4" really would serve no purpose."

Sure it would. It gets you to 3cm. If that's the look you want.

A word of caution to all the post-form DIYers.

Many years ago, I picked up a post-form top at a big box for a customer who had ordered it. The big box fabricator cut a perfect 45 degree miter. Unfortunately, the homeowner built his addition out of square. When I threw the L-shaped top on the cabinets with the short end against the wall, there was about a 3" gap between the wall and the splash on the long end. The top was junk. If you can't measure out-of-square walls and bisect an angle, you'd better walk away from this one.

In addition to the IdealEdge formica which has the mitered edge to hide the black lines, there is another line called ColorCore. It is solid all the way through so there is no dark substrate to show upon cutting. Here is a link:

https://www.formica.com/en-us/products/ccore