I've done it lots of times before and updated and it went away but i can't decide if i should do it again, and my warranty is already voided, my phones white, so i don't care about the warranty. Should i do it or not, and why.
As ucfgrad said, we can't really tell you what's important to you. I've been trying to make the same decision though, and I think I'm just gonna wait for 4.3 to see if AT&T charges for Wi-Fi hotspot. If they don't, I won't, since that's really the only feature I desire, but if they do then I'll consider it.
You're kidding, right? Hardware modifications will automatically void the warranty, they won't even touch the phone in a store.
OP - do you have problems buying stuff at the store? Like, you bought milk once, but then got orange juice, but you're not sure if you should buy milk again? Go with what you want to do.