I always hated upgrading Nvidia drivers. I know it's necessary, but more often than not, it causes regression in some game's performance. Secondly, I have a lot of NV inspector profiles with custom SLI bits, SGSSAA etc. Last time I upgrade my drivers, I was half asleep and the upgrade process overwrote most of these and I lost a lot of my custom profiles! (I know it's my fault, and I'm just ranting right now)
Anyway, I'm still on 411.70. I'll have to backup my NV Inspector profiles first and hopefully, I can restore it back with no issues.
... And now there's a reason for not updating. Also, I'd like to take this opportunity to implore everyone to stop installing Geforce Experience. Unless you absolutely need Shadowplay, there is no good reason to choose GE over NV Inspector.