I've got the 44", 60" and 72" Husqvarna Branded bars by GB, the 50" has become Unobtainium,
I don't have enough time on mine to give a Durability statement, but others have commented on their Quality, and so far, I have no reason to doubt them
Mine are .404/.063 and I use them on my 390XP, 395XP, and 3120XP