For what's worth my friend's got an SE-R and while I know it's a long shot from a standard Sentra, it's a pretty decent car. The interior's not bad, the engine's quite nice, the handling's good, CVT's so so... but overall certainly not a bad car for the money.
And it ain't a POS that's for sure..
Oh yeah... one thing that's sort of worth mentioning... the all-seasons on the SE-R are ABSOLUTE CRAP in snow... you won't be moving with those...