I can't recommend highly enough. Bought for my 1.8 Sport 1998.
The silencer box is smaller than the original and all stainless steel looks great. Tip looks great. Not boy racer at all which was my main concern. And totally changes to look of the car from behind but in a relatively understated way. No need for dual tips me thinks. Sound is not loud and around town its just a nicer timbre of sound. Seems to flow easier but I have not changed the mid-pipe section so can't be too much.
Fitting I had bought smaller bolts (read about issues in earlier reviews) but didn't need - it aligned perfectly using existing bolts. I bought in January 2012 so maybe they have fixed that issue. Unscrew the two nuts, push the three rubber hangers out (easiest using a crowbar) and replace. 10mins all going well. Admire. Definitely buy the gasket, you need it for a proper seal, and the exhaust shops seem to buy their exhausts and gaskets together as sets so you would need wait for them to order in... And MX5parts are cheaper anyway.
I did the two bolts myself and got a fitting shop to do the rest - 5 mins for them on the ramp. I'd do same if I ever do another exhaust replacement.
One thing I didn't expect is the change in sound in the cabin. Before I used to hear the mainly the engine and then the exhaust - these were separate. Now the sound in the cabin is together. Hard to describe, but its much better. (I have the K&N Ram intake & filter).
What else, emmm...all the mechanics comment favourably. I guess they are so used to boy racer stuff... also commented that it must be expensive...so price seems OK.