Disregarding the general "if it isn't expensive it isn't good" logic I see some people have chosen to follow, I went ahead and ordered the EBC Yellowstuff pads. While Summit said that they were supposed to be a direct fit for my caliper, they were actually about 1/2" too long, so we traced a correct backing plate on them and cut them to fit. I'm assuming they were maybe for the AD22 caliper that came on the NX2000 or the 200sx SE-R?
Anyway, I must say that they worked really well. Right on par with the Carbotech XP-10 compound I was using before. The pedal isn't quite as firm when you first step on them, but after about 5 feet it seems to firm up and feel really nice. The modulation is also quite controllable and after about 15 laps of hard, race-speed braking at my home track they were still working great!
If that doesn't tell me that they work, I don't know what does. In short, we'll be in contact with EBC about the backing plate size issue, but even if they say "too bad" we'll be buying these pads again in the future. Shipping did take about 2 weeks even though Summit said they should ship the next day, but that's more of an issue that we'll have to take up with Summit.
I mean, for literally half the price of the Carbotechs and comparable performance, this is exactly the pad I've been looking for. As of this first run, the longevity seems to be up to par as well. I'll post back here once they are used up to let you know just how long they lived.