When you bought the bike you had the opportunity to look it over, possibly ride it, and compare it to other bikes in it's price range. I assume at that point you were happy with the bike or you wouldn't have bought it.

So how well do you like the bike now? If you have discovered you hate it you have a perfectly good excuse to use for returning it.

Assuming you bought the bike to ride and enjoy, however, is the model year number going to affect that? It's the same bike that you were happy with when you bought it.