I like Crashbar a lot, although his name doesn't really fit too well with him I feel. Having learnt that each Junkion kinda has a TV trait to them (well, Wreck-Gar and TRashmaster who likes wrestling shows), I like to imprint a bit of my own head canon onto them. So Crashbar here is a bit of an Easy Rider as opposed to a dude that goes fast and smashes into something.

The robot mode is good, very flexible and its modular nature is fun. The blades in the wheel is a really nice addition, although I have trouble making it into a nice looking weapon.
Transformation feels very Animated Prowl like and the bike mode is pretty nice, if a bit floppy. You have to peg it together with the exhaust pipes and saddle bag things.

Also his facial hair is great!