I bought a Reba RL120 29er solo air last year. It didn’t work. They sent me another one. It didn’t work. They sent me another one. It didn’t work. I serviced that one myself. Yes it was packed with too much grease inside and hardly any oil in the lowers (doesn’t take much anyway!!)- which was what folk said might be the case. I cleaned it out and put half as much oil again in the lowers than they recommend. Yes the first 20 miles after servicing it, felt good, but no, the second ride I’ve just done on it didn’t feel so good.
Look for the comments others have made before you buy one. I think Rockshox have/had a problem with the air shaft. Without a doubt air pressure was building up in the outers on all mine, because you could stick a zip tie between the seals and the stanchions and release it, and I think the negative and positive air were not balancing. Whatever the problem was I had three brand new Reba forks that all lacked damping and bashed you about, rather than ironed out the trail for you.
One point of interest for you……
What fork offset does your bike need?
Gary Fisher used to use 51mm offsets and the Superfly is probably based around his designs. Reba only come in 46mm offset unless you get the longer axles one.
I have an X-Fusion Slide which I really rate. That has a 51mm offset and I think it is cheaper. Mine has never achieved full travel. After two years the lockout isn’t functioning. Yes I must service it. No I haven’t been arsed yet, BUT it is head and shoulders better than the Rebas I’ve had.