This is a big improvement on my previous tuner (a Boss TU12). I guess things have moved on - but this is more convenient, reacts much more quickly & positively & - in my case, this is important - it can 'read' the low B of a five string. The TU12 would only read down to C, so tuning the low B was always a pain. If I set out to specify a gigging musicians tuner, it would look like this.
Model Year: 2005
Where Obtained: Oasis Music, UK
This is 9v battery powered, with the option of using a mains transformer. The signal tracking is impressively quick, positive & accurate - making the practice of always tuning from flat of the correct note (even the most expensive machines have backlash in the worm & wheel) quick & intuitive. There are facilities to set the reference point a little either side of A=440Hz & also to set the tuning several semitones flat (don't expect to need that - but lots of people do). Has everything necessary for its function & not much else. Just about right.
I can discern no effect on the signal when used in line - & there's certainly no noise.
Don't think this could be much easier to use - nice big, bright display of the note (even I can see it when it's on the floor). Good, obvious red LEDs either side of the green 'correct' indicator. Hit the button, tune, hit the button again &...rock'n'roll.
I've only had it for a couple of weeks - used it on one gig. The quality of build & robustness seem adequate for the function (no small achievement - this lives on the floor with rock bands...). Don't anticipate any problems but my cynical nature suggests that I deduct one point for the unknown (only one point? thought I was more cynical than that).