I'm certainly missing the power at the moment, but I'll see over time how much I really miss it and if I want to FI the MX5 up to ~200bhp.
What I do miss about the CTR is its dry seats. The window seals are a bit naff so I've packed them with foam and sealed them up. I've also used gutter sealant under the front one to stop water coming in there. The rear light was also letting water in but I've put a new gasket on that, waiting for my other one to turn up which is on back order but I think that problems resolved, I just need to keep clearing the condensation as the exhaust keeps things toasty back there (which is handy!).
I'm looking forward to some dry days to see what it can really do, but I'm very happy so far. Lots of mods that can be done but as a standard car it runs well and does the job. A full service is on the cards pending work bonus amongst a few other things. For a 70k car it's a bit rough, but it's 15 years old and to be expected IMO.