I've been using the GY F1 D5 for more than a month now and so far pretty happy with it. Got pretty good grip and seems to be good value for the money. The PS3 is also a very good tyre but quite a lot more expensive. The most obvious advantage of the PS3 vs the GY D5 is that the PS3 is non-directional asymetrical, so it's still easy to rotate in any direction. The D5 is directional so can only rotate in one side. Another thing is the PS3 should be more silent. The D5 is slightly noisy in my opinion.