I have had only excellent service through RSA.
When initialy looking for cheaper car insurance, More Than came on top.
I ordered the policy through the internet completely hassle free.
I then had need to transfer my policy to another vehicle. This I did by telephone and was dealt with by a (local) very efficient, polite and friendly person.
The documents arrived the day after and my policy was logged with the DVLA enabling me to tax my vehicle through the internet.
All in all a good experience and I always recommend RSA to my friends.