On my first front, about half worn, and halfway through two rears.
These tyres are exceptional. I got a good way into the rear tyre before needing a new rear to ensure I could complete a long touring ride in Tasmania. The front barely showed wear by the 2000km mark and the rear was about 1/3rd worn, so the rear was replaced and the first one kept for later. The new rear and semi used front were taken to tassie for a week of heavy abuse. Only one slightly wet day, where the tyres performed ok. Theyre a little greasy in the wet, but Im not hugely experienced in wet riding so my comments shouldnt be given much weight in that regard.
In the dry, these tyres are amazing. The front is super communicative and very confident. Ive never been able to scrub in tyres as quickly as I can on these s22's. The bike initially had pirelli supercorsa P2's on it and these tyres are very comparible, the level of available grip and feel is very similar. I think the rear on the pirelli was superior, though it did wear out in 4000km for me, the pirelli front was quite good, but not quite the confident feel the bridgy had, and the pirelli was significantly thinner. My pirelli front lasted 4600km. In australia, I was quoted $100 more for the set of pirellis than the s22's.
Ill be sticking with the bridgestones for the foreseeable future, Im wrapped in them. I expect to get near 6000km out of the rear and likely two rears to one front. For the money, theyre a damn hard tyre to go past.