The 550m was the first real muscleback blades from Wishon. The cavity back version was really the set that got me into clubmaking ho-dom. They are great feeling clubs, a little small sized compared to most today.
515s were a taller faced fairway woods. Pretty hot, although it took some talent to get them off the deck. Awesome off the tee though, that 3w would perform as a short driver.
949mc was a lower profile FW. The first iteration had little/no grooves, and some people experienced knuckleballs in damp conditions. I never had any problems with the 949s though.