I had a larger version of the same parts washer. The pump crapped out after less than a year of very moderate use (on motorcycle parts). Then there's the problem of disposing of the dirty solvent. You can't just flush it down the drain.

I don't miss it for bike stuff. For cleaning cassettes and chainrings I just use paper towels with some wd40 sprayed on. I never remove a chain to clean it as wiping down with a rag suffices.

I often drive part way to work, do a ride, then finish the drive. I'm not leaving a good bike on a roof rack all day, or driving at 70 mph in the rain with the bike on the roof. I'd never own a roof rack anyhow as it's too likely that I or someone else would drive into a low garage or tree with a bike on the rack.