I've had mine since mid May. The phone has it's share of issues, mine in particular has a fondness for reboots. Other owners have had issues with overheating, bootlooping, miserable battery life (above and beyond what one could expect with a dual core machine), etc.
Many have gone through 2 or more replacements looking for one that at the very least will operate as advertised, many more have resorted to rooting (myself included) and flashing custom roms to solve some of the issues. Support/help from T-Mobile and LG has been sad at best, and a Class Action Lawsuit is in the works for what that's worth. Promises of a Gingerbread update have been almost constant since the device release with the latest rumor being in Q4.
I personally like the phone, and as long as I can keep it functional with either custom roms, or other means (fixing permissions in CWM) I'll keep it. If it gets worse, I'll drop it in an instant and go to something else.