depends what you get. i got two bikes from wal mart, a 07' next power x 18speed mountain bike and a new 08' next lajolla single speed cruiser, although most of my bikes are higher quality. the full suspension mountain bike is like the "yugo" of mountain bikes. cuz all the money went into the full suspension, the rest of the components are marginal at best, and it heavy, but rideable.

now i absolutly love my 08' next lajolla single speed cruiser. for under $100, you get a single speed cruiser with a lightweight aluminum frame and wheels and 3piece crankset. much better than the $79 power x i also have by the same manufacturer. this bike is really light especially for a cruiser and cuz all the money didn't go into a full suspension frame and shifting systems, the basic components of a single speed bike are better and almost feel like a quality bike shop bike. i've had cannondales, specializeds, schwinns, diamond backs and paramounts and this next lajolla has that same quality feel and is easy to upgrade.

so yes, some walmart bikes hold up very well, as long as your not paying for bogus full suspension set ups, or disc brakes and cheapo gearing systems. keep it simple and if you can live with a single speed cruiser, a nice bike can be had at under $100. and yes, i commute 6 miles to work everyday on my lajolla and have zero problems or complaints.