Reg great bit of kit for the price, you just need a quiet room, and get a bit of experience. All the people i have made and worked on watches for are all happy, one particular friend is very fastidious, He only wears his watch in the evenings(he is a drainage technician) you know the sort of drainage i am talking about! so he tells me he winds his watch every morning and it sits all day next to his radio controlled alarm clock he comes home from work puts the watch on, wears it all evening and then when he goes to bed he puts it back next to the clock, after about a month he complained that it had lost about 10 seconds, I was elated!
I bought him a beer and educated him a little, no complaints any more just good reports I gave him the info from the old rolex paper work
so that he can try and work out the positioning to get it perfect,
But back to the tool its self it is very good once you learn to set the volume pick up for the right movements and cased or uncased. I have my pick up set in a bed of foam to insulate it from the desk a little, It is not a replacement for a witchi watch expert but a damn sight cheaper.