I am impressed with their interface and features (some not fully developed yet).
They are set up like Enom complete with internal domain pushes, but also have domain parking and evaluation services with PPC, etc.
(they have a $8 domain deal for wholesalers, no volume needed)
Oh, and they will probably go even lower than the previously mentioned price point if you're buying in REAL volume. I can't talk about specifics, since bulk customers get given private deals, but what I can pass on is that it's worth talking to them again if you're going to be registering many hundreds or even thousands of domains.
I'll have to look into using them. My eNom reseller account isn't quite cutting it price-wise and feature-wise anymore, even GoDaddy is now selling some TLDs cheaper for single sales than an ETP top level eNom account!
I guess because of that their number of *unique* clients is much, much less than similar-sized registrars (when comparing the number of domains under management) and that's why not many people are talking about them!