Ok, not sure how to help everyone with the Contacts/Phonebook problems (I had similar problems with the doubling/tripping of contacts etc... but I just sucked it up and fixed them all manually... then proceeded to backing them up via Gmail. I think if they're linked to Gmail account, you greatly reduce your chances of losing them. Plus you can access them from ANYWHERE! Always a plus!)...
BUT! For all of you with network problems... I'm with Rogers. I upgraded last weekend and everthing was fine (besides missing a few 1.6 features like others here). Internet seemed to work fine as well. I saw the little H too. HD video recording is super awesome now. Like someone else said, the brightness of the screen is MUCH MUCH better! The only thing that wasn't fine was the thing a phone was meant to do - makes CALLS! Everytime I called someone, the second they answered the call would be dropped and the screen would become blue (similar to the SMS background). I thought something had gone horribly wrong in the update. But my coworker who's dealt with similar occurrences in the past suggested I pop out the battery, wait about 30 seconds and pop it back in. What do you know, it WORKED! Apparently popping out/in the battery fixes oddities in phones. So if you haven't done it yet, that's my suggestion to all of you having problems. It could fix some of them!
I am still having problems at times with the connection, my texts will sometimes not send on the first try (even if they are one-liners)... Haven't figured that one out yet, but I will let you all know if I do! But it's not a big deal to me right now, considering... at least, not yet.
Here's hoping the next update (I heard something about Q1 in 2011?) is much better than this one was! the x10 is such a beauty. I would hate to see it be despised in the future because of bad software. :/