Depends on the target - very happy with F2 from the RASA with larger objects but the short FL does limit at times. I dont like/enjoy mono imaging, so I dont need to worry about changing filters
. For the RASA8, tilt is a bit of a pain, but I can get reasonable results across most of the frame of APSC which is good enough. for me.
For longer focal lengths I do like the F5.3 on my Mak Newt.
Probably my ideal setup would be a RASA11, plus a 10inch F4 or F5 Newtonian at 1000-1200mm FL but might need a new mount as well.