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whether all the HSU models(STF-2,VTF-1) justify the extra money as compare to BIC H-100 or only high end are better?
Whether they all justify the money depends on you. Most are a significant improvement in SQ.
Dr. HSU assisted with the H100's design, but it was done so within the costs / margins that BIC desired. BIC wanted a 12" driver in a $250 subwoofer, so some trade-offs were made.
HSU's cheapest sub with a 12" driver is the VTF-2 Mk3 @ $469 promotional pricing, and until recently, their cheapest sub with a 12" driver was $599. HSU has said their subs offer better electronics / crossovers, compared to the BIC, and presumably a higher quality driver as well.
New Lineup
VTF-3 HO....12" XBL2 driver...500w amp...dual 4" ports...21.5x17x25 HxWxD...9137.5 cu in...*93lbs
VTF-3 Mk3...12" driver..........350w amp...dual 4" ports...21.5x17x25 HxWxD...9137.5 cu in...*90lbs)
VTF-2 Mk3...12" driver..........250w amp...dual 3" ports...22.0x15x23 HxWxD...7590 cu in......*80lbs)
VTF-1.........10" driver..........200w amp...dual 3" ports...19.5x14x18 HxWxD...4914 cu in........44lbs)
MBM-12......12" light driver....350w amp...one 4" port.....19.0x14x18 HxWxD...4788 cu in......*47lbs)
Old Lineup for comparison's sake:
VTF-3 Mk2...12" driver..........350w amp...dual 3" ports...22.0x15x23 HxWxD...7590 cu in.......80lbs)
STF-3.........12" driver..........300w amp...dual 3" ports...22.0x15x23 HxWxD...7590 cu in.......78lbs)
VTF-2 Mk2...10" driver..........250w amp...dual 3" ports...19.5x14x18 HxWxD...4914 cu in.......57lbs)
STF-2.........10" driver..........200w amp...one 3" port.....19.5x14x18 HxWxD...4914 cu in.......44lbs)
STF-1.........8" driver............150w amp...one 3" port.....19.0x11x16 HxWxD...3344 cu in.......35lbs)
* Shipping weight.
The BIC H100 uses a 150w amp.