Have you been able to record/stream?
I've got these new drivers installed too but have been unable to get ReLive to work for recording. I don't stream, so I don't have anything set up to do that. I'm gonna stick with my MSI Afterburner/Rivatuner setup for recording.
I still get the battery drain under load while gaming with this driver. One or two notches below maximum brightness seems to slow the drain pretty decently though. I was at 90% after about an hour and a half of BF1. As for performance, it seems to have fixed the awful ten to fifteen second 0.5fps stuttering I was getting once every 20-30 minutes. The game is smooth, it may be a little bit smoother now, but I'm not in a position to do side-by-side scientific benchmarks on this as I'm traveling. I'm really happy with the gaming peformance and everything looks very nice at 1080p with highest AA option and about 50% medium/50% high settings. It feels like I'm getting around 40-60fps (vsync on) depending on what's going on in a full 64 player match. That's more than enough to be competitive and I've been leading matches consistently just like I do on my 980Ti equipped desktop. I'll snap a pic of what I'm using when I'm not on a plane.
End of the day, this thing matches the PS4 in graphics compute power, so expect to be able to play most things at decent graphics quality around 1080p. Some games like Overwatch are better optimized and you'll be getting a locked 60fps or above if you're not using vysnc for some reason.