Two things I don't like about the Solo 2:
1.) You are doomed to replacing batteries all the time.
2.) With all battery-powered items, as the battery power gets very low, performance suffers. Escort claims the Solo 2 does not experience this "performance loss" but I don't know how much I believe them.
Personally, I have an Escort Passport 8500 X50 (used to have the regular 8500) and as much as I love it, I think my next radar detector purchase will be a Valentine One. I prefer everything about the 8500 X50 over the V1 but I feel like the V1's directional arrows and bogey counter are two priceless features. I am tired of looking all over the place like an idiot every time my radar goes off, and it's not uncommon (in my area) for me to be driving and go by a cop doing radar and less than a minute later, go by ANOTHER cop doing radar. The 8500 X50 does track several signals at one time but since the unit does not let YOU know how many signals it is detecting, it is hard to know when it is finally "safe".