yeah theyre decent depending on your point of view.. i liked mine.. got very loud and took 600 watts well. keep it in the 4-600(unclipped) rms range and youll be happy. oh.. and ported pwns sealed in VRs imo.
keep your gains down... i think 750-800 is pushing it for that sub. im sure youd be fine but its better safe than sorry. set the gains with a DMM for 500 watts-550 watts.. youll get full output from the woofer... adding that extra 200 watts wouldnt give you enough of a boost in SPL to risk damaging the sub.. esp if you plan on slamming rap for hours at a time.