this piece of kit does exactly what I want it to do. and best of all you just leave it clipped to your guitar and don't lose it (like numerous other little tuners i've had)
very easy to use- just one on/off switch button on the right hand side (not being hand-ist but as most people are right handed and therefore right handed guitar players wouldn't it be better to have it on the left- therefore it would be on the top when it's fixed to end of your guitar? hence saving you from curling your finger round the back trying to find it in the dark on stage when you should be rockin' the crowd). Now i'm just being fussy as there is nothing else i think think of that's wrong with this- very small, very reasonably priced, sensitive/accurate (but not annoyingly so) and very clear and colourful read out screen with big letters- green coloured for in tune and red for out. all round great addition- i've never been so constantly in tune! sometimes i use it just cos it's there- not even when i think something's a bit out!
one other thing- i wish it would swivel. although - it does tilt up to any required angle and you can move it around wherever you want so can't complain, especially for the price.