I switched from a 920 to a 930 a week ago so here's an honest opinion.
I changed my 920 as it was getting old after 2 years. After having some issues, i decided to get the 930. To be honest, it's a good phone but it's not impressive by any means. It's... ok.
First of all, the display... sharp if static. As soon as you scroll left or up and down, you'll want to puke. Colors get mixed up, it gets really blurry... nothing to brag about. Crazy saturation which, thank god, you can adjust. But still, the 920 display was much more comfortable to use despite its lower resolution.
Camera is better.... which is not surprising considering the 920 aging hardware. But it's not like an incredible upgrade. Shots are sharper, sometimes too much actually. So, yeah, good but once again not great.
I miss glance as i was used to it. I have owned the n9 and the 920 that both had it. However, i do understand that people don't use it and don't miss it. But it's not my case, i still miss it
battery life is weak. Better than on the 920 however my 920 is 2 years old... another "ok but definitely not great".
Double tap to wake is slow as ****, at least compared to the 920. It takes a few seconds to wake while it is still instant on the 920. Which pisses me off at times.
It does get hot. People who try to defend this are simply wrong. It's an issue and you will notice it. The 920 had it so it's a bit disappointing to see it again. However, i was aware of it so i can't really be mad as it was my choice to get it.
So, what's left you'll say? It's thinner, lighter, it feels better in the hands (way better actually), the camera is better, everything except the double tap is snappier and that's about it.
So here's something to consider. Yes the 930 is a good phone and as i already said in another thread, i would have enjoyed the phone better if i was coming from a low-end phone. Coming from a 920 the gap in performance is noticeable but it's not really huge. In other words, looking at the 930 issues (for me), it is a minor upgrade not worth the investment, especially now. MS might introduce a new flagship soon, i would suggest you wait instead of purchasing a phone that may disappoint you. I got it brand new, unlocked, in box with a wireless charger for €300... that was actually good deal which makes the issues easier to swallow. But is it worth spending the full price? I wouldn't say so....