I changed from the 185/55 Michs to the 195/50 Toyos.
For the money I cant complain - as Ive had (we I guess I dont have too) to type on many occasions:
I found the 195s far better and more grippy, harder and stable for normal driving - motorways, dual carrageways etc.
I found the 185s far better on back roads - I lost a lot of top speed on the bumpy back roads switching to the 195s as they are too harsh.
I guess its down to what you want and need - I would like to return the car to the standard tyres as they carried more speed where the car excels - but then I dont spend much time on backroads driving like a lunatic so does it really matter?
If I hadnt driven my favourite road before and after the tyre change I would never have noticed the 10+mph difference and the 195s "feel" faster even if in certain circumstances are slower. The car gets more unsettled at a lower speed on the 195s.
I have contemplated 195/55s for the best of both worlds LOL