I installed Hawk HPS about 6k miles ago, here are my observations:
Pros:
* WAY less dust than OEM
* ABSOLUTELY no noise/squealing
* Cheaper than OEM
* In normal street use no difference to OEM
Cons:
* no holes for the brake sensors (which I don't care about)
* I would not advise them for track use, I had fading after a few laps at Laguna Seca
Summary: I will/would buy them again. I will buy either Pagid Orange or BHP XPS for the track and run the Hawk purely on the street and Auto-X