I'm using this with the VTF3-MK2 sub (12"), not the VTF2.
I use this system with the Onkyo TX-SR701 receiver (85W x 5).
I don't use this system for SERIOUS music enjoyment. This system is for my PC, for DVD movies, Satellite TV, PC gaming (6.1 surround) and for listening to MP3's.
For DVD-Audio I bought a pair of Polk Audio LSi9's and a Bryston 3B SST amp. STILL waiting on the Bryston amp...
I did briefly hook them up to an old Yamaha amp, but it produced noticeable distortion (and begin to burn up since it can't handle the 4 ohm load). Still, they sounded amazing.
The Ventriloquist system produced clean undistorted sound. The only gaps in frequency response that I noticed was high frequencies, like in excess of 15K Hz. Which I usually don't hear in most music anyway, so it's not something I miss. Unlike, low end frequency response (20-25 Hz).
As for soundstaging it did a good job. I can't comment much on this since I have not heard a lot of high end systems in order to compare them to this one, but all I can say is I have no complaints.
The Ventriloquist cost me $200 when I bought it with the VTF-3, and with the Onkyo receiver and high quality wires, the total package ran me $1700.
Which is probably ridiculous for most PC gamers but then I've always been an audiophile by nature (always appreciated good sound, although I've only recently been able to afford it), so this system is a dream come true for me. I finally have a great system that is awesome for gaming, listening to the TV/DVD movies, and to listen to MP3's.
The Polk's do provide a LOT more midbass though so I get a lot more impact from them. Which is basically the difference with bigger drivers, smaller ones are going to lose the impact at lower frequencies. The Polk's cost me $800/pair, and the Bryston amp about $2,300...but that system I know will last me at least a couple of decades before wearing out, so it is well worth it.