I've got four SS3S0 and to be honest, they're soooooo not worth their price. They sound like a fuller body 5692 with a touch immediacy (not as laid back as the RCA or CBS). But the price ... I wouldn't bother. I got more of a kick finding generic "Standard brand" boxes for these Swede Standards than their sound. :P But it's all subjective.
There are minor but noticeable differences between all three Syl 6SNWs. The metal base is brighter and more lively, but it's also more prone to microphony, which I think may be the primary reason for its brighter sound. Both tall bottles have fuller bass than the short bottle but the short bottle is tighter sounding (for example, kick drums have excellent PRAT). The short bottles are also a lot more reliable than the tall bottles I've had so many metal base and tall bottles fail on me over the years.
Edited by Len - 8/12/13 at 8:21pm