I have an 8 plus coming from a 7 Plus. I'm glad I upgraded. The sound is better. Glass back adds grip and I don't have to use a case now. The camera is better in low light. Wireless charging to me is a great convenience when charging in the car. I don't regret upgrading one bit.
Exactly and throw in 4K @ 60 FPS, slow sync flash, True Tone, makes it a worthy upgrade to some (including me). The glass does make the 8 Plus easier to hold than the 7 Plusn