They are not dangerous - there is no way Nissan would allow their use if that were the case. How many times have we read about owners losing their cars exiting roundabouts etc. Its mostly down to what you do with your right foot, particuarly when its a rwd car with high bhp. TVR's are notorious for tank slappers as they have no TC/ESP (or whatever you want to call it) and no tyre in the world is going to save you if you don't drive according to the conditions.
As far as wear goes previous experience had suggested that the Miches should be the best but then Trev the Rev has found otherwise Again, I'm sure much of the wear issue is more around driving styles although personally I would stick to well known brands. As I have said before, Toyos would probably be my tyre of choice noting some of the informed opinion that has been expressed on this forum, and they look good but that is purely a cosmetic thing.
At the end of the day we have these cars because they are great fun to drive and if that means burning some rubber that's what its all about
cant comment on the stones, only what i've read, i can say i changed from p-zero's to falkens and i didnt notice any difference in grip ! , the p-zero's lasted 15k on the rear, cant comment on the front as the tracking wrote those off