There's one on RSOV (ACM or something), about £90 NOT including P&P, customs and all that. I used this one mounted on an L85 for a game (while someone borrowed my carbine & ACOG). Very Good eye relief, managed to look down it whilst wearing a lower-mesh mask and huge viper goggles. Has full magnification. Only problem is the base/mount, the owner said he had to file it down in a few places due to it being a cheap China-soft copy.
It wasn't illuminated. IRRC, seeing as how the real thing is illuminated via the magic of radiation, the only illuminated SUSATs are the real SUSATs. Seeing as how the MoD is replacing the SUSATs because radioactive part is almost dead, buying a real surplus SUSAT may turn out to be pretty pointless, as it could last a month, last 6 years, or be already 'dead'.
(Willing to be corrected on the above illumination bit, but I'm pretty sure it's only available on the real deal)
G&G SUSAT had pretty poor eye relief, either wear very low profile glasses, or don't bother buying one.
Never seen or used ARES/Star SUSAT - but - every time I've met someone with the L22 (which comes automatically with a SUSAT) - players tell me they instantly replace the A/S SUSAT with something else. Make of that what you will.
