I've had nothing but problems with my 1020 on the last 2 builds with constant battery draining and cortana is basically useless. she takes 30+ seconds to respond to you.
I've literally given up, when they can make W10M work smoothly i'll do it, but i'll stick to what works. WP 8.1. They expect to launch this OS relatively soon and it's unreliable. Yes i know it's a technical preview, but the last version was released to the public on the 950. Yes i'm comparing a bugatti to a fiat 500 but they both have internal combustion engines and work.
I'm not expecting a glitch free experience, windows 8.1 can't offer that. I'm expecting the same experience but improved. I've provided feedback on all the issues I've encountered.