I've owned the Ditto and Ditto X2. Both were good pedals but had a tendency to get dark and muddy after a few layers (overdubs) were added to the first loop. If I added five or six layers, my songs turned to soup.
This little guy (and I do mean little!) somehow maintains fidelity and the loop layers stay clear & crisp. Best of all it has all the features of the X2 (which ranges from $180 to $250 new) for approx just $60 bucks in a foot print about a quarter of the size.
I don't know how they crammed it all in there but I'd say this is better than the more expensive X2 unit mentioned above.
Instructions are minimal & you'll need to download their software to export/import loops (this last part was omitted from my instructions).