Its an amazing phone, but not out of the box. Autokiller is a must for this device. For battery life I use CPU Master free. I rooted mine, themed it, changed the default launcher, and now it's like a whole new phone. I've had mine since launch day and at times have been very frustrated with it, but once you tweak it a bit with apps (most of which don't even require root) it's a quick little thing that does what I need it to do.
Kyocera Zio, rooted
OpenZio theme, Zeam Launcher
840 Bench, yes my Zio is faster then yours is