I installed the racedeck flooring in my garage about 8 months ago and I really like it. It is harder to get clean than a smooth floor but you don't have to worry about slipping. It is also very comfortable to work on and very durable. For cleaning I usually wait for a warm day and hose it out. The way it is constructed and the slope of your gargage floor takes most of the water out. The air can still get under it to dry out. I have not had any trouble with mold or other nasty stuff underneath.
For normal cleaning you can use one of those string mops or a "swifter" type cleaner. Just make sure to keep the mop clean or you will leave dirt behind the little bumps.
Only negatives are that it is sometimes difficult to roll the cars around on the car dolly, static electricity, and the mopping. Nothing serious. Great floors.
I would post a picture but I don't know how.
For cost you would need to talk to the racedeck people. They are very helpful.
Hope that helps.