I have a few Wonderbars. Keep one in my bag most of the time. I find the Countycomm versions a bit small to be really useful, but they are cool.
I also have a Stanely Extreme Fubar. That thing is an absolute demolition monster. It's the size of a hammer, weighs about 4 tons and can run through just about anything found in residental construction short of a security door.
Cost me 40 bucks and I would have spent at least twice that replacing broken hammers had I not picked it up.
That rubber handle lasted about a week and the top was all mashed and mangled. I cordwrapped it and it's holding up just fine.