I can't tell you exactly why, but I recently picked up an absolutely mint Polytune2 pedal $50 used, and I think it was an absolute steal, and I love it. ZOMG so much better than the Snark and Snark-clones I've been using, trying to get them to register all the strings. I have a great Seiko plug-in unit, but its not a pedal-style so you had to have it up on the amp using the effects loop, and that's just a PITA, and its not lit, etc.
Maybe its because guys try to use them in polyphonic mode and don't like how that works... I just use normal needle mode and its fine. I tried to like strobe mode for a bit cuz it seemed more techy hardcore but honestly the needle is easier to use when the pedal is on the floor.
The PT2 is amazing, and honestly having a mute is hugely helpful also. I was hesitant to go to a floor pedal tuner cuz I'm generally anti-pedal, but I love the mute for swapping instruments or fiddling around etc.