we have 2 of 3/8" axis long handle flex ratchets in my shop, they get a lot of use, but at least once a month they strip out and need rebuilt. it's not unusual for both of them to be broke at the same time. The heads are real floppy and the last time we had to use a torch to get it apart after the bolt head broke off leaving a very small screw loctited in place
I'm holding out for a snap on 3/8 dual 80 long handle flex head, they just released the 18" breaker bar, I may just use one of those to make one.
I like mac and have plenty of their tools, but the axis heads are too small to be strong enough. Even the mac 1/2" axis has nothing on the snap on version, it not even close.