Costco has great warranty & return policies; however, their selection often seems to be 'end of the line' production runs.
I recently bought an 'end of the model year', higher end Sony 55" HX 850 TV for a great clearance price from a big box store as Costco had only lower end Sony models. Similarly, the same box store beat Costco's price on a Sony BD by 30%.
Like anywhere these days, check their price vs their competitors. Having 'Wholesale' in their name is a little disingenuous because their prices are certainly not wholesale throughout the store.
A couple of things I do like about them. They are a constant instigator of gas price wars locally plus their $1.50 hotdogs + drink is unbeatable.
Don't get me wrong, Costco is an overall great outfit & we spend a lot of dough there & generally save a lot of money. We are most happy to be members...