The 350 always ran great but the carbs were always a pain to keep in proper working order(diaphrams). I built my old 550 up to give to my girl to upgrade from the 350. Sold it to fund a trip to Laguna seca grand am race.
I agree with what you say on the smaller bikes, I had a cb125 and I regret everyday selling it. Such a wonderful bike to ride around town. I'm always looking for another but they seem to rarely come up for sale.