I upgraded my Note to ICS the day it came out without a single problem, while I don't notice any speed increase, I also don't notice it being any slower either. I've heard complaints from people saying their devices have gotten slower or their battery life isn't as good, then I have also heard the exact opposite. Frankly I think both camps are imagining things.
Yeah, I can understand that problems do arise, but not to the degree of something like this with the iPad. This is one of tens of thousands of similar threads about this problem online, which means that it's effecting probably millions of iPad owners. Yet have we heard a single peep out of Apple about them doing a darned thing about the problem? Nope. They even delete messages that hint at the possibility that the problem lies soely with their iOS and not with anything the user has done. (They did it to me yesterday, that's why I know this).
If your iPad started working when you bought a new router, well first of all I'd be ****** upset that you had to buy a new router just to get your iPad to work. I'm sitting here with over a dozen devices within arms reach that are on WiFi in my house that are working 100% properly and yet, I update the iPad to 5.1.1 and WHAM, it stops recognizing my WiFi, does that make it my router's fault? I don't think so. I update the firmware and software on my machines all the time and NEVER lose my WiFi because of it. That means the problem lies squarely with Apple and nobody else. I should not have to replace my router, which is working perfectly, because Apple doesn't know how to code properly and I have no intention of doing so, that's insulting and absurd.
As for resetting my router, my router is down in the basement and I'm currently unable to walk, so I can't get down there to reset it. It would mean having someone come over to go down in my basement and unplug a wire and plug it back in just because Apple can't do their job properly. That's a load of kaka and I refuse to do it. This is 100% Apple's fault and if they refuse to take care of it, I have NO problem checking out that sweet new Sony S Android tablet, it looks quite nice. And hey, USB port, SD card slot AND FLASH SUPPORT! WEEEE!!!