Horrible!
I joined them while in search for a cheap .ca registrar that accepted paypal. When I found them I was thinking "Finally, I found it!", but I was sadly mistaken. Stupidly, I 'bought' a domain from them without researching them first, thinking they were legit base on the look of the site. After paying for it, I thought it was fishy that I didn't have control of the domain, so I waited. I contacted there support VIA the support ticket, and I got back what I felt was an automated response. I then researched the site and found tons of bad reviews and found out that ICANN terminated them as a register months earlier, yet RegisterFly was still claiming that they could sell domains.
I then opened an dispute in PayPal, demanding that I be refunded. Four days later, with no actually reply, they refunded my $13.