While trying to find what sounded like wheel-bearing noise ("airplane noise") on our 2009 Mazda 5, I found that the driver's-side inner (tripod) joint boot had let go at the small end. I assumed that it was the tripod joint making the noise, and did a lot of research as to what was the best aftermarket drive axle to replace the entire unit with.
A very respected professional mechanic told me that most new or rebuilt units are junk, and that I'd be better off going with OEM or rebuilding mine. (One exception is Raxles, but they don't supply Mazda axles.) Surprisingly to me, he told me that the biggest problem is that the aftermarket axles have skinny shafts that vibrate badly.
I bought a new kit from FEBEST, which included the new tripod joint, boot, grease, and splined end which goes into the transmission, and rebuilt my original drive axle. The band clamps they supplied were very low-end though, and I bought upgraded ones instead. The rebuilt axle works very well so far. The old tripod joint was in very bad shape, and was pretty much falling apart. Glad I caught it and replaced it when I did.
Surprisingly to me, this didn't cure the airplane noise. That turned out to be the front passenger-side wheel bearing on the way out. Got that changed out too, and all's well now.
All this to say, there are alternatives to expensive OEM or cheap aftermarket drive axles - you can rebuild yours if necessary.