I fitted this on a previously passive Iceman bass. The shafts of the pots aren't long, so I had to do a bit of woodwork and the width of the dual concentric tone control is bigger than a normal tone knob, so the hole needed to be rewired. They give you a good amount of cable to position the battery.
I had a problem in that after grounding the bass, it no longer made any noise and found out that the wires that went from the balance output to the tone input were reversed which was shorting out the board. Taking the pins out of the plug and putting them in correctly (as the silk screen on the board shows) fixes the problem. Also note that there are no instructions with these preamps, although instructions are on artecs website. Everything is wired (even if incorrectly) apart from battery +/- and jack out/ground/switch solder terminals on the board.
Apart from the wiring issue, which is why I marked quality down, the actual quality of the preamp is fine, I can hear no difference with it in or out of the circuit with the tone controls flat, as it should be, and the tone controls provide a useful range of options.