I have 2 Very bad references for them, and the first thjing they ask u is for your credit card, with that referrences, no thanks.
1 Rebel.com was a pioneer "registerflyesque" registrar.... i have not the registers at hand but i remember well a HUGE problem some years ago.
2 i note some strange things about a friend with his domain stolen by rebel and now parked with them. Nobody with a premium valuable domain NOW stay with them .
For other parte they are now associated with poll in catch and release (http://www.pool.com/help/faq.aspx
) adn some wierd "icann registrar direct access level" via myrebel.com ...
And in domain blog in domaintools say some very weirdness:
Too weirdness for me.