JVC DR-MV(1|5)s

I'm still after either a unit with a VHS recorder and
a DVD recorder in it, or possibly separate units if
this is sensible (transferring VHS to DVD required).

I was looking at the JVC DR-MV1. This seems to have a
number of issues. Someone mentioned that a "DR-MV5" is
available, and should be reliable. What's the difference?