I have the V-LPS, with the regulated power supply. I compared stock wall wart to regulated PS, and the difference is notable--use the regulated if you can.
Then the comparisons I have done with it:
>Cambridge 640p (V-LPS very close, but 3 other listeners picked v-lps besides me)
>Rolls VP-129 (nobody of 4 people thought it even close--notably muddy lows and rolled-off highs)
>Rolls VP-29 (surprisingly close at 1/3 price, but still not quite as good as v-lps)
>NAD PP-2 (sounded almost exactly like cambridge 640p, but all four agreed v-lps just a little better)
I agreed with all 3 of my friends who listened using a jolida 202 tube amp, and a thorens turntable (forgot model, but 80's vintage pretty high end), that the v-lps delivered better low end and airier high end on the Klipsch LaScalas.
On my Rega Planar 3, with Yaqin el84 tube amp and Klipsch KG-2s, I felt the same, but only comparing the VP-129 and VP-29. It's possible that the tube vp-129 doesn't mate well with full tube amps, so I am not trashing it, just saying it didn't work well in the otherwise tube systems tested on.