so far so good for me.
My 920 still has a fair bit of lag but its alot quicker than it was with the black update.
Impressive for a 2 yo device.
But, all this said, I wish they updated us 3-4 months ago.
If they did, I would have had more of a chance to feel it out, and give it a go for a while before considering a switch back to ios, but with a few weeks till the iphone6 is released, I doubt i'm staying.
At&t I think is more to blame than Nokia on this front, but what do they care.
No knocks on Windows Phone though overall, happy to see its expanding user base, especially in the foreign market where I think they will gain a lot of tracktion.