That's a very bad thing. Domain registration isn't something you want to trust to an upstart that could go out of business, sell the business, or encounter legal problems they're not big enough to handle. Losing a domain name for an extended period is about the worst thing that could happen to an online business, like mine... worse than losing a payment processor, ad network, web host, or any other service. Without your domain, your customers can't reach you and nobody can buy from you... and you can't simply buy another. Stick with accredited registrars with a few million domains in their portfolio.

Now add SOPA to the mix for a site that hosts user content (like blog comments). If anyone files a right of action against you, the registrar pulls your domain, and you have 5 days to file a counternotice to get it back. If you're buying from a reseller like this, how many of those 5 days are wasted between the time they're notified by the registrar they resell and them notifying you? You really don't have the time to spare -- you need to get that notice, retain counsel, write and send the counternotice, and get it to the registrar (who you may not be able to directly contact by buying through the reseller) before time's up.