don't know too much about them, except that they are supposed to be noiseless. Does this mean they are a stacked hummer? Do you need 500k pots for them as with standard hummers? (in a passive circuit) What kind of overall tone do you get from them? That is comparing them to stock single coils...I have SD 67-70's in one bass and they have a lot of midrange. I hear that SD QP's have very little midrange. The stock Squier Affinity JV pickups have less midrange than the 67-70's, but not exaclty scooped....those kind of comparisons.