I've got about 1000 miles (mostly commuting, and a small amount of mild offroad) in my HiViz PowerShell. and it's still kicking ass ;)
For the offroad stuff, I was quite comfortable, it fit over my boots well, and I was able to move around with more than enough freedom to control the bike as needed.
For the commute in particular, the PowerShell's versatility shines - the venting, pockets and visibility are great - while I still "ride like I'm invisible" I'm pretty convinced that it makes me visible when I would otherwise not be.
One thing that I think might be an interesting addition to the next iteration - nonskid material similar to what's on the ass of the suit on the inside of the knees. In the wind, I find myself gripping the tank of my WeeStrom with my knees ( I grip the frame actually), and some sort of grippy stuff might be helpful.
When I get home from work every night, my 13 year old daughter proclaims "Nerd Alert! Nerd Alert!"