Ok. Got it in and installed in about 10 minutes, only because I had to go to the kitchen and do a hot rinse of the collection cup. Very very simple installation. That's the great part. It's been running for about 30 minutes now. Lots of bubbles but no skimmate yet. It fits like a charm and I'm very happy about that. Even though it hangs off the back, it only requires about 2 inches, so I didn't have to pull my tank out too far.
The negative so far is that this thing is pretty loud. I'll have to figure out whether the noise is coming from the pump and vibrating the plastic of the aquarium, or whether it's the aerator. In any case, I'm going to need a muffler of some sort. We'll see.
Overall, happy with the skimmer as long as it starts producing gunk.