Ran these for around 15k. Unfortunately had a puncture in one (and it didn't blow out after 10 miles).
These have been amazing tires, better than any of the Michelins/Continentals I've tried before. I've had Primacy HP and Continental Sport Contact 2s and this blows them out of the water.
Dry grip is mind blowing, although they do screech on the limit which can make you look a bit of a numpty but oh well.
In the wet I've never had any sort of aqua planing, and you can corner hard without much perceivable loss of grip. They also kick up a whole load of water which shows how much they clear in terms of standing water.
I got around 12k on them, a mix of motorway and fast & hard b-road abuse, this includes a day of drag racing as well, at 12k they were down to around 4mm so I put them on the back.. Could get around 22-24k from them, the diesel engine in my car adds weight and load to the front end and with 280lb ft of torque it certainly puts them through their paces.
I'm unsure of what I will be replacing them with in the future, as to whether I will get a new set of these or get some Eagle F1 Assymeterics 2 (which are actually cheaper than the Sessanta's. They are £93 vs £98 for the Sessanta.
The only negative thing I found with these tires was that, just around dead centre there was a lack of initial response from the car which was not present on other tires. However they offer great feedback through the wheel and you can really feel what the car is doing. Oversteer is easily controlled and progressive.
I give these 9.5/10.