[fabadam]

Thanks for the tips. Tightening up from the BB is probably a good idea indeed. Most opponents seem to have very little idea of the value of position. There's also lots of open-limping from the SB.

FWIW, you see a wide variety of styles, though generally not of the archetypical calling station type. I've seen some guys who were unbelievably nitty (VPIP below 20 bascially from both positions) or the types who push any ace and pocket pair preflop.
This is one of the reasons I deliberately play slow -- HU takes a lot of your energy and concentration away from the other tables since you need to observe play better (I play no more than 5 tables ever, anyway.)