I have both the RA1 and B2 (OK I'm greedy ).
RA1 was very good - simple to use and updated via modem (no home PC at the time) - my Dad then wanted one so he has the RA and I got the B2.
B2 much neater to install and like the fact it can be unhooked and hidden easily - had one issue re: slow sat lock but very quickly resolved by origin who sent me a new aerial FOC overnight.
Both work well - at least they have not missed any cameras so far - and can easily have the radar element detached in future.