I had bad problems with my Samsung Galaxy (both the physical hardware and customer service people) and WILL NOT GO BACK. Once burned - twice warned.
In particular the GPS chip was inadequate and failed on a regular basis. At a minimum you need a special access code to reset it through software (something I had to do on a regular basis) and occasionally needed to do a factory reset to get back in operation. This is a documented error on the phone - but they refused to do anything about it. My phone was replaced with a refurbished phone which had the same exact problem.
Eventually I had an additional problem and neither MetroPCS or Samsung would replace the phone because the refurbished phone was out of warranty (even though replacing the original phone with the refurb did nothing to solve my problem and in one way made things worse).
At that point I sent off letters to the customer service at both the carrier and Samsung - and have not heard back from either one.
A friend had an Optimus V and even though it was a far less powerful phone with less memory and no keyboard I decided to get the Optimus V. I have _NEVER_ regretted that decision, even with the limited amount of memory in the phone (the biggest hardware limitation) and the plan I'm on which has less minutes than my previous plan.
Moral of the story - avoid Samsung at all cost. If you think it's great for you then fine, but I've been burned too much. The fact that customer service won't even respond or try to make me happy tells me they've got no interest in myself as a customer in the future which is fine by me, there are a lot of other choices out there.