RE: Saito 62a vs OS FL 70
I do like the FP engines and still have over a dozen in all sizes, but they seem to have been built with longevity in mind, I think they were the last line of "entry level" engines that really were built to last the duration. There are still lots of used FP engines flying planes these days.
One good use I have found for the LA engines is control line flying, the dismal power of these engines is not a handicap here, in fact they work well.