I've currently got around 500 domains parked with them. Their overall customer service is very good. They'll send you e-mail about domain validation issues (misspellings, conflicts, unable to verify, etc.)
It's easy to submit names, but they need a "domain already submitted" feature like Sedo, so you don't re-list the same names.
Three services to ppc park with. I use fabulous and domain sponsor. You'll have to play around for which to use on specific keywords. Got a $2.82 hit yesterday on a loan domain.
Good stats and sorting features. Domains get picked up by search engines after a while (PM me for examples). Sometimes a bit slow to sort.
Overall, they are pretty good. I'll keep using them even as I experiment with others.