a guy at work has one for doing bike parts, he did a few bits for me the other day and i was really impressed. i was going to get one myself but i do so few bits its just not worth it
I've got one of the kits but never used it. Cost around £80 and is quite comprehensive. Instructions are clear and it doesen't seem difficult so intend setting it up idc so always available for the odd item. Items need to be spotlessly clean.
I have one from Gateros Plating......good fun, and I'd recommend getting one.
One thing I will say, if you're going to try it out, go to Maplin and buy a variable power supply....makes a hell of a difference and you'll get good results.