Recently acquired a secondhand SIP cast iron 10" and am delighted with it.
Light years ahead of my previous Record RSTS12 which was a huge dissapointment. I made the mistake at the time of buying it unseen on the basis of the Record name (I now know better !), a mag review and the spec which sounded good (induction motor, sliding table etc). Really lightweight and insubstantial and I actually actively avoided using it unless I really had to !
The SIP is a pleasure to use, with a proper fence and new crosscut sled that I knocked up (ala Norm), and with a new blade on it's way from the D&M show (has to be bored specially to 1" as not the standard 30mm bore unfortunately). Only reservation so far is a bit of slip in the mitre gauge/slots but will work on that at the weekend, until I can afford the Osbourne EB3 replacement !