As a newcomer to the Nikon rangefinder I have recently, on good advice, (Thanks Tom) purchased an S3. This is partly because they are more plentiful and less expensive in the UK than the SP, true everywhere I think. Unfortunately punitive taxes makes non EU imports a no go so the relatively less expensive USA market is closed.
I have been converted (Thanks Tom) and now have another S3, couldn't resist an Olympic with matching lens.
By careful watching an SP has come on the market at a price which I consider reasonable and I will answer your question when I have given it some exercise as it is due to be delivered before the end of the year 😀
Why did I order it? Because I felt I should own, at least once, the "flagship" in the series. If it fails to impress the market is strong enough for a re-sale at little or no loss (I always say that but it rarely if ever happens, lenses and bodies become magnetically attached somehow and I can't bear to be parted.)
I also have had little opportunity to try before buy as the market here is so limited. The largest dealer in S/H cameras in the NW UK, in Manchester (Real Camera) has seen one in 20 years trading. I would be interested in the earlier bodies, but more out of curiosity, the SP is much more of an icon and a must try.
My problem is over here they nearly always come with a 50mm lens so I am accumulating those as well, luckily up to now across the manufacturing range so subtly different.
Is the SP worth it? Lots of shooters I respect think so. Like all cameras it can't be an answer to every lens or finder need but as an additional tool I think it holds promise. If you don't at least try one your last words may be " I should have tried an SP" we don't want that do we 😀