Although I am also waiting for a fix for the RGB issue, I believe the 115i Platinum is still a solid buy, IMHO. Having 1 color currently on an RGB enabled device does stink, I'm hoping corsair will step it into high-gear and work on a fix. Same thing happened to my Corsair RGB Strafe when it first came out years ago, and it did indeed get fixed.
If it helps you decide to get it, I went from lower 70's in temp with an r7 1700 at 3.7ghz on all cores with stock cooler, to low 30s while gaming. iCUE software reports 23c though. Running Cinebench I get low 50s. I think it's still a good buy, just with hiccups.