I just put up one 4' x 8' section of charcoal Proslat. The installation isn't bad, if you follow the instructions precisely. I've used Proslat slatwall accessories, a Hyloft slatwall shelving set (45" wide wire shelves), and an Azar acrylic shelf (probably only 18" wide). I'm going to purchase items from different brands, and even some items designed for pegboard, to see if they fit. I have another 4' x 8' section to install, and I just ordered a 4' x 4' section in white.
By the way, an impact driver goes a long way in making the install easier. I installed the initial 4' x 8' section solo, other than having my daughter hold the initial j-channel against a level line.
I had to cut around a GFCI, which wasn't too bad. I was patient, because I wanted clean cuts, so I used aviation snips for most of the cuts. The backside has an airgap, and is ribbed, so it's a bit challenging to cut. I scored it multiple times from the front, till I could see that I was almost through. Then I just set the scored edge, face down, on a stable flat surface. I then hit it with a deadblow hammer (relatively gently), till the piece snapped off at the scoring line. I didn't get any of the stretch marks you can get with plastic materials when you stress them.