I have a tu2, pitchblack, and polytune mini
The only thing the poly mini doesn't support with regard to bass is the polyphonic tuning. Single string stuff is still perfect. I use this one for my function and pub bands
For one of my bands I use the pitchblack, as it has a courtesy 9v out, and I can use that for an extra pedal
The tu2 is my back up. Still a great tuner though