Things I liked: Works well. Makes me completely independent. The gauge is accurate. I have even used it to pressurize a small scuba pony tank (6 cu. ft.) - though I had to take that in stages
Things I would have changed: A longer hose would be helpful, though the standard hose works fine
What others should know: The video is helpful, especially the reminder to pause at the top and bottom of each stroke. It is a bit more time consuming but it guarantees a full pump. The pause may be as long as 3 seconds when approaching full pressure.
Things I liked: This is an addition to my earlier review. If anything, I am more satisfied with the 909 after using it for a couple of weeks. The power remains startling ever time I pull the trigger. Accuracy is on a par with many .22 rifles. Shooting from field expedient positions, offhand mostly, I can hit a two inch steel spinner at 25 yds. every time if I do my part. I have chronographed various projectiles - the round ball at 143grains and a number of 200gr. bullets. The figures for the gun at Pyramyd are accurate: I got 703fps for the round balls and 604fps for the 200gr. bullets. I have swaged and shot bullets as heavy as 240grs - no chrono data yet - and they were as accurate as the lighter slugs.
Things I would have changed: N/A
What others should know: It's loud. You are not going to shoot this without the neighbors knowing it.