No failures to date with Hacker 2- A20-26 and 1 30 size, with Castle Creations Phoenix SC's. My last purchase was a Hacker A30-12L and CC control. I ordered the Castle link also for programing the SC on the computer and I say THAT is a super product.
My foamies weigh 12 to 16 oz (Charger RC) and the prop I use is 10x 4.7 slowflight with the Hacker A20-26. Also I think any battery less than 1100mah is not sufficient for these motors. Lesser mah batteries will die from over use too soon. About a year and a half of flying so far and I fly them a lot. My two 1320 TP's are doing good but the 850 died months ago.