PS4 is great!
Overall grip levels in dry are excellent for a very otherwise standard street tyre. I do not believe anything comes close to them.
Definitely the best wet weather tyre I've had hands down. I haven't tried them in ice/snowy conditions however, but I can't imagine any normal tyre fairing amazingly when well out of their temperature range.
There is nothing at the price point I've researched that comes close to the PS4 other than RE003 - which can be a good option if they are significantly cheaper than PS4 (they often are).
The downsides are: sidewall is very soft, which can lead to great ride quality however is not something you want if driving very hard/track use, and they're a relatively soft compound compared to the rest of the class (hence the increased grip).
The PS4 are IMO the best value tyre out there at the moment.
![Cool 8)](./images/smilies/icon_cool.gif)
If you're unsure as to what you want in a tyre, get these, they will not disappoint.