We're about half-way through the repairs on the WRX at this point; the new cold-air intake and carbon fiber hood are installed, and all that's left is a last little bit of massaging of the front frame, replacing the upper radiator hose, and draining and refilling the coolant and oil (20W50 doesn't like 0F weather very much).
My impressions of this hood just keep getting better and better; it was, by far, the cheapest hood we could find to replace the original mangled one, and the fit and finish on it are far better than they have any right to be. Seibon definitely get a thumbs-up from me; it looks like it came on the car from the factory. My only complaint, really, is the grille mesh they used over the intercooler vent inlet; I think we're just going to paint that black, and call it a day (the idea of having something there to catch random junk isn't a bad one, but that mesh is just plain ugly).
Similar kudos to APS for the cold-air intake; fitment (even with a few items slightly relocated because of the collision) was damn near perfect, and it's certainly unobtrusive. We'll probably keep the main front-oriented air snorkel that feeds the passenger-side fenderwell with air, just because I'm a little concerned about airflow back there, but otherwise this was a pretty straightforward affair. We'll see in a day or two if their claim that no engine management modifications are necessary hold up to real-world use, but for now, I'm happy with it.