I have RR in Columbia, SC.
When it works, it is great.
ALL too often, they have a bad router a few hops away from me.
I have had TOO many experiences when I report a BAD router and provide a Trace Route and a WHOIS, where they try to frigging tell me it is not there router and they can not garantee anything about other routers on the net.
Also, the local cable companies ALL have different customer data bases in different formats. Do you think the National help desk can access the customer data base in Columbia, SC? No, so I bet we are not the only ones.
When an ISP can't tell who its customers are, and has no idea which routers are theirs, guess how long a bad router can stay broken? Only thing worse than RR is EXODUS network.