Wanted to do an update, got about 7k on these now and have somewhat rethought my initial impressions.
Dust:
Only significant difference between these and factory pads is that the dust washes off easily. No "real world" reduction in dusting -- wheels are completely black within a few days. Also still getting embedded particles that require clay for removal.
Performance:
No change from initial impressions. Have to remind yourself that the first cold stop is gonna need a little more distance, but other than that they work great. Routinely scream up to a light using half the stopping distance of other cars.
Rotor wear:
Light grooving, I've seen worse with stock pads and rotors on other cars I've owned. No warping or pedal pulsing yet and I use them hard. Safe bet that rotors will require replacement at pad change though.
Noise:
Squeal is gone. Only time I get noise is briefly after car wash or rain when rotors have light rust.
Conclusions:
Not really happy, but wouldn't put the stock pads back on. Stopping performance is noticeably better and they are VERY slightly cleaner.
Would I buy them again? Probably not, hoping for more options come replacement time.