They are as good as every one says, best out of the box spinger at sub 12 ftlbs. I used to have one and sold it to fund my PCP, big mistake, although I love my S310. I have a Pro Elite, but thats not as good as the Pro Sport at sub 12ftlbs, but it does come into its own on FAC power levels though.
The only way to check on availability is to phone. JSR will not take your order unless they have the stuff in stock. I know that from experience.
When the S310 was at its most popular ever one seemed to be out of stock. So I offered JSR a deposit so I would get one when they next came in. They refused, saying that they would not take orders unless they had one in stock. You cant be any fairer then that now, can you?.
regards
jim