There was a good thread on TZ recently with plenty of of S2000 experience being expressed.
http://forum.tz-uk.com/showthread.php?333510-Roadster-debate
Some useful bits (i’m having a slow day at work)
Earlier cars (pre-2004, distinguished by the separate front grille and blanked-off air intakes) had a more pronounced step in power delivery below the point at which Vtec kicks in (Yo!), and a stiffer rear suspension set-up, the combination of the two tending to catch out the unwary. Later cars, known as post-facelift (2005 onwards) used different engine mapping which gave a much flatter torque curve and makes the engine very tractable and useable lower in the rev range. I use mine for everyday driving in towns and around the New Forest, which has a 40mph speed limit, and there really isn't a down-side. You still get the manic kick in the back above 6800rpm, all the way to 9000, which I realise doesn't suit older drivers. The rear suspension was recalibrated, with slightly softer springs and anti-roll bars for the "facelift" cars, which tamed the rear end in extremis…..
...Alignment is hyper-critical on the S2000, and replacing siezed adjusters along with resetting the alignment (the S2000 has double wishbones all round, and there are 26 adjusters - three per wishbone and two for the front caster) is expensive. The adjusters were never lubricated when the car was built, and a combination of water corrosion and electrostatic arcing will corrode the bolts into the sleeves which run through the bushes, so it's a labour-intensive job…..
...The right tyres are also crucial and have a profound effect on the handling.
I did getting on for 100k in my 2 s2ks, and probably 20 track days between them and never spun once. I did a couple of car limits days and spun loads (and learnt loads too...)
A couple of points: people often over-correct and fishtail into the scenery. Actually if you ease back your inputs quite often the car will sort itself out. On a trackday with my wife I made a complete mess of a hairpin and let the car sort it out for me, she now thinks I'm a bit if a driving god! (Well not really but she did think it was quite well done...)
Secondly, I have a theory that the action of the diff sometimes make the car feel like it's over-steering when it isn't. For the unwary, cue opposite lock action with potentially disastrous consequences...