In a full scale rating of 1 - 100. 100 being the best in all criteria, 1 being the worst. I will rate registerfly a "1".
Their system is bugged. Any coupon when applied in the cart does not fail, hence a failed order, but money was never refunded unless emailed support 2-3 times.
Lets say a domain expires on 5/30/2006. On 5/29/2006, the domain will be "locked". You cannot update contacts, dns servers, get auth code, anything. This is a "forced" method for registerfly that force their customers to renew at registerfly at a high registration cost of $9.99 for .com, $8.99 for .net and .org, and other tlds.
If you want more info, take a visit to
www.registerflies.com. I do not want to see you experience what I had experienced.