I had a TOL BEL and I didn't care for it; I didn't like the mount and I felt that it was TOO sensitive. It would pick up radar signals from parallel- and cross-highways. I stopped using it over a year ago.
My dad & my wife pitched in and got me a V1 for Christmas, with the remote display, and WOW. Once you've seen the arrows and numbers, it's all over. I have the display mounted low on the dash, by the radio at the bottom of the instrument stack.
Case in point: I was driving on the cross-valley Monday night, going a bit over the flow of traffic, maybe 70-75. I know where all the building alarms are, but as I passed a familiar one (indicated by a side arrow), instead of 1 bogey the V1 showed 2; one to the side and one behind me. I slowed down, passed the factory, and the side bogey went away, but the rear one got stronger and stronger, and finally it was full strength and screaming; I looked in my rear view and there was an unmarked car tracking me. By then I was about 5 mph over, but I was also on a regular commute where cars were flying past. I guess he had me culled out and was waiting for me to speed up to the rest of traffic, which was going about 15 over (70 in a 55). He tracked me for about 2 miles at 60, and then he finally pulled off to wait for another target. If I'd have had the BEL I would have never registered the second bogey hiding in the signal of the first, and I wouldn't have slowed down. And I wouldn't have known that the full strength signal was tracking me from behind.
I wasn't a V1 believer before. But I am now. Having had both it and the BEL, I much prefer the V1. The BEL was actually a nuisance; the V1 is a sentinel.
A V1 will never be obsolete, btw; each unit from the very first one is fully upgradeable to the most recent specs.
Tom