bump, can I get some help pleaseee?

Looks like a novelty that is also expensive. I'd pass.

Does it require a special installation process or will it attach to the existing spigot for the shower head?

I’ve never seen one before, but it looks a little forceful to me. Imagine standing under that with a bit of a headache.

We considered doing something like that but it required some sort of extra plumbing which required a lot of extra space, so in the end we didn’t. I think they use a ton of water too

I wouldn't do it if only because it's not sold in the US and has a German "G 1/2" connection thread. Also, if you install it and don't like it, what are you going to do? It installs flush with the wall; you can't just unscrew it and screw on a different shower head. Instructions.

I've had one in a bathtub, am trying to imagine it in a shower. At the rate that tub filled (a soaking tub), I would think a shower would go through a whole lot of water I might not be willing to pay for unless you are an in-and-out type shower-er along with anyone else living there. It might be a nice shower experience. Having had the Kohler waterfall in that tub, I wouldn't include it in a shower however. But then I wouldn't do rain shower as the only head either. In my real life, I need something more efficient. With landscaping, laundry, showers, misc...my water bill now is as much as I'm willing to pay.