I have a mothers Milk Middle and Neck on my strat.
I absolutly love them, clean they have a very accoustic sound, give it a bit of overdrive and you've got a lovely smooth warm tone.
They also handle higher gain situations well, to put in to perspective, i've gigged with mothers milk in the neck/middle postion, and a sinner in the bridge in my thrash band and they did fine.
Let us know how you get on with them. They are, like all BKP's amazing pick ups.