I have never used digi voice recorders myself... but my father does. He actually has a few... and I believe he liked the one he bought last.. it was Olympus I think.
Some others had a problem in that their advertised recording time would factor in playback at slower speed, and would severely deteriorate the quality of the sound. So, they will roughly be at 50% of their ad rec time to function efficiently. Can't remember any other thing about them.
I have sony ICD and with voice quality and other features I am happy but the only thing I miss is when you transfer it to PC you can not see the time when it was recorded, which losses the whole point of VOR.