Absolutely worth the investment, but as others have said, nothing makes you invincible (or invisible).
I run the 9500ix, wired into the rear-view. I know the V1 is a great unit, but I also know myself well enough to say I am an idiot, I would start ignoring false alarms and I would get lazy. With the GPS enabled detector, if you've driven a road a few times before, and you get an alarm this time, it is the real thing!
At the same time, with laser you still need to be really careful - wide open stretches that seem too good to be true probably are (at least in New York). If you're worried about laser spend the bucks and get something you can integrate with jammers.