I have the DP01. This is the first recorder I have ever had and, therefore, cannot compare it with anything.
It records only 2 channels at any given time and I found it difficult to learn how to do that. Perhaps if I had had previous experience, that would not have been the case (plus I am older -60 -and technical stuff is not as easy for me as for a younger person).
The only other problem I had was the manual. I am a concrete-sequential personality and the manual was not set up for me. I ended up printing things out in order with the corresponding manual page numbers.
If any of this helps, I am glad.
Dale