I've had my V1 for over 10 years. It's so old, I can't remember the year I bought it. I checked the software version using the technique described in one of the stickies. The 4 numbers were 0137.
It's served me well; just 1 ticket during it's life. However, recently I've had the urge to get a new detector. I did a bunch of research (on this site and others) and it looks like the V1 is still at the top of the class.
I was about to order a new one. I went to their website and noticed the upgrade option. My unit is so old, I qualify for an "instant upgrade". Basically, for $279, they send me a brand new unit. Sounds pretty sweet.
It would be nice to be able to keep my old unit. (I would give it to my wife). But, I can't complain. I assume everyone is familiar with this service, but in case not, I thought I would mention it.
Nice site, and nice set of forums.