I took advantage of the "Free Tuesday" admission for San Diego county residents to visit the SDASM.
For those of us who grew up watching the Apollo program, it's pretty cool to walk through the doors and see the Apollo 9 capsule in the entrance.
The layout of the museum was a little confusing at first, but once I figured it out, it was great to wander through all of the displays--and there are plenty. Some are right on top of each other, which makes getting a complete view a little difficult.
There are portraits and biographies of famous aviators throughout the museum, and plenty of explanatory signs and videos (with seating areas to watch).
Of course, with San Diego being a Navy town, the collection is skewed more towards military aircraft, although there were displays of racing and some commercial airlines (notably, the formerly San Diego based Pacific Southwest Airlines (PSA).
For the kids, there were several attractions tailored just for them, and some flight simulators that you could ride in for a fee. There was also a small cafeteria on the patio/balcony outside the building, appropriately called the "Flight Path Cafe," as it's directly under the approach to Lindbergh Field.
You could probably make it through the museum in a hurry in an hour or so, but it really warrants 2-3 hours to see everything in detail (and more if you're a real sign-reading aviation enthusiast).
It's a well done museum that I will definitely suggest to out-of-town guests who come to visit.