On my 2002 MCS I traded it in before I had to replace the tires. I did have a second set of take-off MC 15" rims with the stock Conti all season tyres that I used for my winter driving. Both sets of tyres were worn to the wear bars when it was traded in at 36,000 miles. I found the stock Dunlop runflats to be a very satisfactory tyre, other than the obvious ride and cost issues. They had excellent traction wet or dry and offered a lot of fun for a factory option. The tread wear was excellent for a tyre with only a 280 index number. Their cold weather performance was marginal which was not unexpected for a high performance summer tyre.
On my 2006 MCS the stock Dunlop runflats lasted about 23,000 miles when they were replaced with a set of BF Goodrich Traction T/A 205/50R16. Those tyres lasted about 35,000 miles. They were great tyres, excellent wet or dry, stable under braking, very good turn-in, excellent tread wear. Would have replaced them with another set of the same thing but BFG had stopped making them.
I settled on some all season Kumho Ecsta AST in 205/50R16, with a tread wear rating of 400, as my daily drivers. As a daily driver they are pretty good; quiet, decent ride, very good dry traction, responsive handling, good tread wear. The only weakness is a marked lack of wet traction even under damp conditions.
In addition to the Kumhos I also have a set of Nokian Hakkapeliitta 2 studded winter tyres mounted on some MC 15" 7-hole wheels in 185/65R15. Absolutely fantastic winter tyre, great in snow, wet, or on ice. Only possible down side to these tyres is the amount of noise from the studs while driving on dry pavement. I find that I'm changing to my Kumhos as soon as the roads are clear and putting the Nokians back on just before it snows again. A bit of a pain, but the tread on the Nokians is lasting quite well, going into their sixth winter I still have well more than half of the original tread depth left.
For the weekends I had a set of Falken Azenis RT-615 tyres in 215/45ZR16 mounted on some factory R84 X-lite wheels. These are fantastic play tyres. They are DOT approved and come with just 9/32" of very sticky rubber. The tread wear number is 200 and they wear out in an inverse proportion to the amount of fun you are having. I got about 1500 - 2000 miles on my first set and was very happy with that. It was three years worth of auto-x and track happiness.
I was so happy with them that I bought another set with their new compound, the RT-615K, and am even happier with them. They have fairly stiff sidewalls which gives them excellent steering response. The traction, wet or dry, has been excellent. At the limit they let you know gradually before traction completely goes away. They allow over steer conditions with complete confidence and predictability.