It took about an hour to do the whole installation. Instructions are complete and easy to follow. Easy to do if you're accustomed to messing around inside your bass. I replaced a passive circuit with a pan-pot. The results were that the pan pot did NOT load down the pick-ups (the way a passive circuit does), and I got a very useful set of controls. I still mostly run the EQ flat, but it is easy to tweak the tone by goosing the knobs slightly. If you're looking for massive changes in tone you may not like this rig, but if you want to brighten up or add some beef to your tone, this will do it. I can't say much about the slap switch, since I don't use it much on this bass, but I'm considering getting the active version for my Guild Pilot. I have some problems with noise, but this was a problem before I added the pre-amp (my bass needs to be sheilded!) and so adding any pre-amp would increase the noise level. It is way quiter than the pre-amp (Mighty Mite?) on the Guild.

Overall this is another great product from Duncan that does what it's supposed to with out a bunch of garbage getting in the way. Also available in a three band EQ version, and Ducnan says you can special order it with different pot arrangements. I've used it for about a year, and hve not yet had to replace the battery. The only problem I have had is that the volume pot works loose. This may be due to the shaft of the pot being a little too short for the thickness of the basses wood in the control cavity so there is not enough room for the lock washer I should have in there.

Check this one out if you're looking for an on-board pre-amp.

Construction	95%
Size/Bulkiness	100%
Usefulness	98%
Value	89%
Noise	90%
Vesatility	96%