My very personal humble opinion on having a GTD for 16 months with the Bridgestone S001's fitted is this. Dangerous - no of course they are not, imagine the law suits that would pertain from one of Europe's biggest car manufacturer's supplying cars with dangerous tyres.
Are they any good - this is very subjective. In the colder wetter conditions I've found them far to easy to wheel spin from pull away meaning you have to feather the throttle in these conditions to get decent traction off the line. To be honest, (with my age), I'm not the sort to go hooning it around on two wheels on a roundabout at silly speed in the wet in any car on any tyre, so I can't truly speak of their ultimate grip at the limit - but from my experience, I would expect them to understeer quite badly.
In the warmer summer months, I've found them to be perfectly acceptable with great grip. Ideal then for Italy or Spain where the temperatures are higher all year - not so good for good old blighty weather.
Are there better tyres, I'm absolutely 100% convinced that there are. Michelin, Goodyear, Dunlop etc. all seem to get very good write ups on here and in the press.
So my conclusion is, whilst I stand by the fact that are in no way dangerous, I for one, will not choose them again when the time comes to replace them. For very similar money (and in some cases less), a better set of rubber can be had which will no doubt do more justice to the brilliant MQB chassis that the MK7 is built in. The Bridgestone's are just average at everything and not really very good at anything, and also seem to be noisier than most - which is a real shame.