It's the strobe tuning mode that makes this tuner great. The strobe tuning mode is the most exact way to tune, and the only one I feel is good enough to actually tune the instrument.
HOWEVER, the "PolyTune" function is a botched misfeature! It doesn't help at all, it only annoys by occasionally popping up even when you're trying to tune a single string.
The solution is simple: buy the UniTune version instead, which has the exact same awesome strobe tuning, but which does not have this annoying multi-string function. It's also a bit cheaper!
The physical build of the tuner is cheap-o, only two stars for build quality, but the tuning function is stellar.