I got the mini.  I recently joined a band and was looking for something a bit more portable than my old Peterson VS-II.  
 
The display is very bright (almost too bright?).  And it does seem pretty quick to get the note.  I don't own a low B so I can't comment on that use.  Great tuner.

The Sonic Research ST300 looks intriguing, however the fact that you need external power makes it a bit cumbersome, being that I do not use a pedal board. It looks like the ST-200 with battery power is no longer in production.  
I do hear rumor of a battery powered ST-300?  
  No major need at the moment but I would love to get one some day. Hope the rumors are true on the ST-300 battery unit.
Pete

And if anyone happens to have an Eventide H9 effects unit in their signal path there is a tuner inherent:

Musician's Friend's Stupid Deal of the Day today is the Korg Pitchblack Portable Polyphonic Tuner for $24.99.  (Regularly $100).  A great deal on a tuner that is +/- .1 cent accurate.
 
Bill, tgo

Love the Sonic Research Turbo Tuner. Mine is the ST-200, which uses a 9 volt battery.  It has been out of production for a few months but its still easily found for sale on the web.  It tracks well and quickly.  The Peterson Classic Stomp Strobo tuner is great, too, but I stopped using it because it's 2x the size and weight of the ST-200.

Stupid deals of the day? I'm in!  
For $25 you can't go wrong!
 
Thanks Bill !
 
Pete

Thanks for mentioning the Korg being the Stupid Deal of the Day, Bill, tgo.
 
I've been pretty happy with the Snark SN-8 Tight tuners, even on my basses with B-Strings. They're very affordable - ~ $15.00 US.
 
But the Korg looks interesting, and for $25.00, a bargain.

That is a great deal.If I didn't already have a Korg Pitchblack rackmount I would jump all over that.Any one who needs a quality tuner should grab this up.

Just received my stupid deal of the day Korg Pitchblack tuner.
Interestingly enough it looks like my bass was setup right already. Intonation perfect and it looks like my other tuners line up nicely with the new accurate Korg. This looks like it will make a nice tool for setups and the polyphonic tuning will make for some interesting conversations.  
Pete

I compared these three tuners, they all seemed to agree pretty well.  The Seiko with needle was fastest, although harder to read in low light.