Its just another brand like Pyle, Crunch, Boss, and lightning (to a slightly lesser extent). Definetly not quality subs, but in the right application you can make them help with lower frequencies quite a bit. I would seal them.
PCIII Custom Sato Banzai map, Scott's Stearing Damper
Sato Banzai's ,2CT's with 190/55 rear
Gilles Rear sets, CRG levers
HID's High/Low, 520 15/42 with Xring
Speedo healer, Corbin seat
"RC51's are not for everyone...not everyone likes twins messing around between their legs"