I love the Bass Driver DI and the VT pedal sounds good. I can easily tell the difference between it and the real thing, but what it does, it does extremely well and for people who want a wide variety of different amp sounds without a wide variety of amps, it's super. I'm seriously considering getting that Leeds pedal just to see what it would sound like in front of my Ampeg, and Trace and Aggie tube poweramps.
I'm guessing that is was not plugged into an amp at all, but instead plugged straight into a computer and recorded. These pedals seem to be just the thing for home recording for people who live in apartments or who can't afford the space and cost to build a real home studio. They provide a reasonable tube tone without having to mike a cranked amp.
"Plugged straight into a computer" doesn't necessarily mean that is what the pedal sounds like. If that
is the case, who knows what the sound of the interface or what kind of editing or plug-ins have been applied to it. A band I am currently producing recorded all their basic tracks live, and all the bass tracks were a DI out of the amp. The bass player had a passive OLP Musicman copy going through a Nemesis 200 watt combo, but by using plugins, on different tracks, his tone varies from P-Bass through a B-15 to T-Bird through an SVT, just by judicious use of compression and EQ. Even my audio interface itself imparted part of the sonic signature, with a nice bit of warmth coming from the preamps.