ORIGINAL: impactiq
Something to think about..... Spring Air makes retracts that are almost identical in size, hole location,etc... as Rom-Air. The biggest difference is Spring Air uses a spring to let the gear down if there is pressure loss. I'm not knocking Rom-Air.... I have 2 sets in planes right now.... but the added insurance of knowing that my gear will come down every time makes flying more enjoyable. IF you do go for Rom-Airs, I would get a modern sequence valve from Robart since this was/is (in my book) the weak link of the Rom-Airs. Another thing to consider too is parts for the Rom-Air retracts, since they are no longer in business.
Just my 2 cents.
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What I discovered over years of using Mr. Rhom's landing gear was that if you ignored their advice to pull off the pressure lines, not cut them off, you were doomed to leaks and blow-offs of the pressure lines. The first thing I look at when buying old Rom-Air landing gear is the brass nipples. If they are scored from an X-actio blade, I know I'm going to have to replace the nipples. Naturally, those with score marks are worth less to me than those without. Regardless of the temptation, DO NOT CUT THE PRESSURE LINES OFF THE NIPPLES.
If the Rom-Air system is set up correctly, the Spring-Airs have no real advantage over the Roms.
Were I buying a new set of retracts today, pneumatic, of course, I would buy the Spring-Airs. I've never used the Robarts, so they and other brands may be good too.
Ed Cregger