I too have just upgraded from the new 3341 to 3.3.5 RC2a and noticed an immediate increase in speed with my BE 24 meg.
Went from about 17meg dl & 1.1meg ul to about 20.2dl & 2.1ul
I'm only about 200meters from my exchange (Can see it from my place) so very annoying that I don't actually get full speed.

Though have noticed that QOS doesn't seem to be working properly. (If I go by the graphs)

Not sure what else is not working properly in the 3.3.5 RC2a but I'm going to run with it for a while and see if it falls over or stays up.

how do i get 3.3.5 RC2a as i'm having issues with 3.3.4.1 and 3.3.4

I got it from
ftp://ftp.draytek.pl/Seria_2820/Firmware/

thanks for the fast reply on the ftp site

did the beta sort the dual WAN issue

Not sure mate, haven't had time to test properly...
You'll have to let us know your experiences....

ok will do

running syslog server and syslog USB for test's
will let new beta run for 1 hour before adding WAN1 connection and see results and post