I haven't tried Works Performance shocks but if Mike Rieck says they're the best, I won't argue. The standard shocks were bad even when our bikes were new, and created a market for after-market shock manufacturers. The koni/Ikon's are the best shocks available here, a little expensive, but like McDonalds, I know what i'm getting before I shell out the dough.
Those cheapies that you see on ebay, Partsnmore, Old bike Barn etc are just rubbish, and don't deserve a place on a thinking mans bike, particularly a classic sohc4. I know someone out there will say "I've got a pair and they're great", but they only say that because they haven't tried Works, or Koni/Ikon, Hagon, Marzocchi, S&W or any of the established shock manufacturers. Cheers, Terry.