I love the Evic, been using it exclusively with the Theorem. Two things I'm most enthralled with are just that. The display is super easy to read, even to these ancient eyes, and the battery door? Yeah, it may be a minor thing I guess, but every time I switch out I'm thankful for it. Takes about 2 seconds.
You know... I'm currently perfectly happy with the ipv Mini v2 ( other than the battery cap I mentioned )... It does everything I currently need and has lasted me a long time. The only lack it has is the temp control. If it wasn't for the FDA changes, I'd wait a bit longer.