I've only had this pedal for a few weeks, but it seems really good so far !
It's a very reasonable price (for a tuner pedal). It's very easy to use, and the light is very bright (so I'd imagine that even tuning on an outside stage would be fine). I also own several boss pedals, and have the boss AC adaptor and cable; I was therefore concerned about getting a non-boss pedal to go with my setup, however I have had no problem daisy-chaining it to the other boss pedals for the purpose of rehearsal powering.
2 very minor things to point out - 1) It is quite heavy, compared to some other tuner pedals (for example the Boss TU3) and 2) the labels on the side of the pedal are a little confusing, i.e. there are 2 "outputs", and it is not immediately obvious (without looking at the manual) which is the bypass and which is the actual output.
But on the whole, I remain pleased with my purchase.