All three of mine arrived this morning, had to sign for the package. The build quality isn't as good as my Snark - more plasticky and less rubbery - but overall not too bad. The battery cover is fiddly - FYI to undo it you have to turn it clockwise, which of course goes against years of knowing it should be the opposite.
There is only one button - press to switch on, press again to toggle to your instrument of choice, 'B' being the obvious setting. In operation the tuner functions well and is accurate, or at least as accurate as my Snark, my Korg Clip and my FZone tuner pedal. I really like the colour LCD display and the 'clock-hand' pointer, which makes the actual tuning very easy.
I also like the clip, which has a very strong spring. Too many clip-ons have weak springs. However I was unable to rotate the display to where I would have liked it (I prefer to mount the tuner behind the headstock), but using the thing on its side is no big hardship. In all I like it and it was definitely worth two quid - as of today anyway, if it suddenly goes tits-up I'll let you know.