I also landed on the Iris rev 7, and it being my first I went with getting it prebuilt plus not having a soldering setup. Also, one decision was comparing the shape and size of keyboards using
splitkb compare site. The Ergodox EZ and Moonlander were way too spread out for my hands to deal with so I chose Iris. Ended up cheaper than either with no included switches and now I’m practicing how to use only three rows and layers since it’s way more comfortable to not move your hands from the home row.