I always use the UW. Not only as a looper but I did many times. It works very well.
The only detail is that you can record one bar only -using several RAM pairs can help- and no layering allowed. I bought myself a EHX 2880 for that matter.
I'm somehow happy you are getting back to the UW after an OT experience, you know... it's kind of reassuring to me and killing some GAS