Huge difference for me, I still have issues inside my house but I have had issues inside with every phone i've ever owned. I think it is my wifi router causing interference because the further I am away fomr my computer the better it is but it's not really an issue because as long as I'm in range of my router I have the wifi connection running.
Outside of the house though it's a totally different story I get solid 4 bars 3g wherever I go since the update, before it would still bounce around and drop to edge sometimes outside of the house. I haven't seen an Edge connection after leaving ym house since the update. 3g is so stable it made me wonder if they just put a patch in to always show full bars for 3g LOL <- I am serious too, not being sarcastic. This is the best phone I have ever owned by far and yes I am a previous Iphone owner that figured I would never buy another phone again because I felt the Iphone was perfect.