i think a lot of this is actually placebo effect and you think they are better.
in reality we are not driving at 10 tenths on the road and the differences are marginal and its not F1.
if you are saving £150 per set of 4 I would go for the super sports as still a great tyre. Ben Patey was doing an offer a little while back of £500 for 4 super sports collected.
mind you those PS4S are a good looking tyre like the CUP2 with the velvety style bits on the side....if you notice that sort of thing like me ;-) saddo! most people think they are black and round and change em when they are bald!!
The super sports are a great tyre and still better than most - no doubt about it. But they have now been replaced by the improved PS4s and the facts are there to be seen. Whether people will see all the benefits is dependent on how they drive their car. However, you will hear the difference in tyre noise and will brake quicker which is always a good thing.
£500 for 4 x super sports is great if your local and can fit them yourself, but for most of us you need to add an extra £100 for the delivery and fitting, and then your into the price range of the PS4s. If the Super Sports dropped to £500 for 4 delivered/fitted then that's a different story as the extra gains for most will not warrant the extra dosh, but as of now an extra £50 for a set of four PS4s is a no brainer for me.
Oh and they do look good as you say!