People have different goals when they start on a project. Lately, mine has been getting in the air while spending the absolute minimum cash.
That's lead me to trim costs in a lot of ways. Experimenting with MegapirateNG, playing with cheap props, and flashing my own ESC's.
I've had a lot of success, but one problem has continued to plague me: I could not make Arducopter (or MegapirateNG) fly with cheap props. It would fly like a dream using DJI's excellent 1038 prop (still my favorite for F450-style quads), but with any other prop, my model would bounce up and down in any altitude-hold mode.
Most frighteningly, these oscillations would become fatal if I changed modes while flying at even moderate speeds. I wrote about that particular problem here: http://diydrones.com/forum/topics/violent-over-correction-on-mode-c...
Over the weekend, I finally discovered the source of the problem: I was using simonk-flashed ESC's.
I went back to using stock F-20A ESC's from HobbyKing, and now my quad flies great with any prop in my toolbox. I tried super-cheap 1045's, 9047's, 9443's, so-called "carbon mixed" 1038's, and of course my favorite DJI 1038's. The quad still flies best with DJI 1038's, but all the other props fly quite well in all modes.