RCA DRC616N 7-Inch LCD Portable DVD Player with 3+ Hour Battery
Great DVD
Had the poloroid one previously with battery problems and then plug-in cord problems.  I wouldn't recommend the Poloroid at all.  I like the size of this one so much.  It's light-weight and easy.  It's hard to find one with the battery these days, which is nice for flights.  We've used the player a lot already.  I have had the occasional stop on some bumpy roads, but not bad.  I agree with others on needing another small bag to carry cords, etc. as the bag it comes with only holds the unit.