I've got a DSO Quad, it works well enough for AVR work, etc.
The user interface is awful and the bandwidth is crap, but... I used it a fair bit before I got my DS1054Z and it did solve a few problems I wouldn't have been able to solve without it. I still take it along to Arduino club meetings because it's portable and fits in a corner of my briefcase.
I say any oscilloscope is better than no oscilloscope at all.