Having had a s2000 and now a zed i think that the 2 are very different. I would say that the s2k is a more focused sports car but the zed is alot better to live with day to day and especially in the winter ( not that i have had the zed in winter time yet) As said the s2k is very reliable but the early ones compared to my 57 plate zed are worse build quality, and noisy with the roof up. Also when viewing a s2k ask to see when the camber and tracking were last done. This is one major problem that affects alot of s2k , seized suspension bushings, which can cost ££££ to fix. If its had the camber/tracking/4 wheels alignment done recently that will show its not seized. I also replaced my clutch and fly wheel at around the 45k mark due to a really mattalic sound from the clutch/gearbox. They , like the zed have a noisy clutch/gearbox/drive train as you are sat right next to it. I had a really good time with mine and when driven in anger can match most sports cars around today. Roof down, air box lid off at 9000rpm you will struggle to have much more fun in a car. Hope this help a little