my buddy has the Orban.. 6 springs i believe.. VERY nice unit - roughly $300 these days (expect some tune up money too.. his needed a bit of werk)
I have the Tapco unit (4400?) its HUGE... independent 5 band eqs. It is pretty BOINING..if you've listened to ANY dub you've heard this reverb
its deffinatly an EFFECT... but the longer ive played with it the more i love it.. good fer reviving dead close miced drums.
the eq is pretty wild and drastic, and the unit is also really easy to overdrive.