My experience is that they fatigue much easier than the Clevite,Federal Mogul or KING bearings that I normally use. Im not a huge fan of the ACL bearings but on some applications ACL is the only choice sadly.
I can do a comparison write up on bearings at some point in time..I just have to get a free moment to get a set from each manufacture and sit down and do some investigating. I have an MLS headgasket comparison I have to do a write up on soon.