Bearings die quickly in filth, but I don't think any quicker than on my other device, which is a Blackspire. Two sets of bearings on the roller as opposed to one on the Blackspire. Dunno if this is a plus or a minus, really. The roller isn't as good on the Superstar though - it could do with a step, as has been mentioned.
Does the job though, and it is very cheap.