I have MPS4 on the front and MPS4S on the Rears and no issues at all. I did a fair amount of research before I went down the road as the front will last 3 years and didn't want the wrong setup - from what I found Its generally considered the MPS4S takes longer to get up to temperature, and on the reviews the tyres were very evenly matched (apart from the temps on track day action and the turn in grip - that said the Track Tyre they do would give even better grip) but on road use there is little difference. Definitely no issue having different front and rear, They even look pretty much the same - you would have to search for the S on the rears.
They are definitely quieter than the Bridgestone's, and don't crash around. We have had a few cold mornings, and while I go steady in those mornings I didn't feel as un-easy as I used to with the Bridgestone's. That feeling its about to stuff you off the road but not going to tell you when its going to do it.
As aside the Michelin is also a nicer tyre to apply tyre shine too. Its much smoother and therefore comes up nicer than the Bridgestone, it also has the Alloy edge protection the same as the Bridgestone, I cannot recall the Conti's having it and the Hankook's definitely didn't
Another point for whatever reason I needed a lot less weights with the Michelin than the Bridgestone's and Hankook had a massive amount of weights added. I know others have a mix - Chubbs also has the same setup. John_K does and I am sure there are others (apologies for not recalling you if you do). They can likely give a view as I have really had them for about 700 miles so far.
Current - 2014 (14) 370z NISMO in Storm White #229, JDM Carbon Nismo Kickplates, JDM Carbon Nismo B Pillars, Nismo Tyre Caps, Nismo Oil Cap, K&N Filters, MY15 Nismo Start Button. GT-R Dome Lens Covers - LED Lights (Interior, trunk & numberplate) - Demand Engineering Full Valved Custom Exhaust System. Custom Blank Button Delete Z1 LHP Upgraded Hatch Struts
Current - 2020 (20) Juke Tekna Plus, Gun Metal Grey/Red Contrast, DCT Gearbox, Clever Little Commuter Car
Previous - 2005 (55) 350z Azure GT Coupe, Parking Sensors, Z Tax Holder, Z Mats, Z Door Guards, White Reflectors, Z Tyre Caps, S2000 Aerial, BT Kit,