I am sorting out new tyres for the ML63.
I did the usual search on local suppliers (Micheldever Tyres) as well as Blackcircles, MyTyres and a few others.
Roughly £200 a corner fitted for a Pirelli, Dunlop etc, most sites had the PS4S at about £280.
Did a google search and Kwikfit have PS4S a price fitted of £230 etc. Then there is an offer of an additional 10% for four tyres.
So total price fitted, balance, etc was £900 compared to £1100 on other sites.
So if you are after Michelins at the moment it's worth a look.
Wallet is still crying.