I recently got the 6" version of the 7 shot. It's a newer one, shipped in 2020, and I'm very happy with it.
I have not experienced the issue with spacing in the cylinder that some of the earlier models had, where sometimes cases with rims at the wider end of the SAAMI spec would touch together and bind. I've tried around 5 or 6 different types of brass in 38 and 357. It looks like they got the cylinder dimensions right.
Compared to other GP100s I've had, the finish is a bit nicer and the action is smoother. It feels great in the hand with the factory rubber with wood panel grips. I used to have an SP101 in 357, and it wasn't fun shooting 357 with those grips because the trigger guard rapped my fingers with each shot. But this style of grip works just fine on this GP100. Just the weight difference between a 6" GP100 and 4.2" SP101 would make a difference in recoil, and I think the handle dimensions are a bit different as well. Anyway, the factory grip is very comfortable to hold and shoot and I like the look.