I have been using this looper for more than 5 years now and I had no issues with the sound quality, but I do start to see some problems with the build quality.
Use:
I use this looper at home for jamming, have not tried it in band context. It has been reliable for about 4+ year , but now it seems, that some parts of it start to wear off. I have all my pedals equipped with Barefoot Buttons, so the Ditto had 2 of those as well. I first noticed a couple of months ago that pressing the Play button with the BFB on did not work. I heard a click as usual but the recording did not start. Taking off the BFB helped for a few months, now sometimes I have to step on the Play button 3-4 times until it actually does something. The Stop button is still fine, but considering that that button is used much less, it is not surprising. Warranty already expired, so did my own research. It turned out that several TC pedals have issues with the spring under the soft-click buttons wearing off after a while. Some people recommend changing or adjusting the spring, but I haven't managed to open up mine so far, due to the weird screws that do not seem to support any screwdrivers I own. So now I guess I just wait until it slowly gives up or I get tired of it and just order something else.
Other than that, it is a good pedal.