I just bought a set of slowhands with a holydiver i the bridge for a maple neck strat, and here's what i have to say about it:
The slowhands are really bitey, very uppermiddy and cutting, no singlecoil 'sag' but a very immediate and responsive feel. Very nice cleans and good lead tone, very good pickups, but i was expecting they'd have a bit softer feel to them. Now, i have 500k pots since a bought a prewired kit from bkp, so that might explain it, but i'd say that if you buy a pair of slow hands dont expect to get mellow jazz pickups, but angry cutting rock pickups!
The holydiver has a nice throaty midrange and can handle heavy distortion really well. They are that kind of pickup that sounds good in any gain setting, but 'feels' the best with lots of distortion. A bit more compressed than i'm used to, but if you want to play heavy metal on a strat they are a very good choice.
The pickups arent the greatest combination, they have a very different sound and feel to them. I pick that combo because i wanted both a metal strat and a rock/blues strat, and decided to combine them in the same guitar, and i will probably never use them both on the same song. So to me thats the perfect combo, but if you want pickups that go well together, pick another setup. Trust the HSS suggestions! :D