I thought I'd share my impressions in switching from an xtr-330 to a V1.
I've owned my Whistler xtr-330 for about a year now. I've been pretty happy with its detection abilities, but after reading this forum and having no basis for comparison, I felt as though I was missing out on some great range. My dad wanted an RD, so I gave him my xtr-330 and set about looking for a new one.
I was about to buy a pro-78 or 695, but a local on craig's list was selling his old V1 for $100. I upgraded it with VR for another $150, so I ended up getting a bran new V1 for $250, which isn't bad.
After two months of using it, I can't say that I've seen a big difference in detection range. The V1 has great detection. But now that I compare it to my xtr-330, well, the 330 had great detection as well. I drive the same route everyday in Indiana on highway 37, and I know where the LEO's hide, and where I regularly get alerts. Maybe I need more sample time. That said, I would not spend $400 on a V1 (I am happy with it at $250). The directional arrows are nice... but the 330 was a GREAT detector at only $50.
Thought I'd share that... maybe the V1 will impress me yet, but I just haven't seen this "day and night" impression I've been getting from reading these forums.