BG65 @ 22 (Old prince racket)
BG80 @ 24 (Arcsaber 9 first re-string from October - still going)
BG80 @ 25 (Voltric ZF 2 strung mid December and was in tact by mid February when I changed it)
BG66UM@26 (Voltric ZF 2 strung mid February, died today)
The BG 66UM lasted about 1 month. It snapped on the first hit of the evening, just off centre. We were about to warm up, a shuttle was served to us, and I caught just off centre. 2 strings went. I have cut the string to prevent frame warping.
The string, while new, is damn gorgeous to play on. Touch shots are a delight, repulsion is easy, and the control is to die for; after 2 weeks or so (playing at 3-5 times a week, 10-20 hours total each week), the string feels awful. The shots feel pretty numb and lifeless, and it's difficult to appropriately gauge shots with so little feeling. I kept over shooting lifts especially, and found it very difficult to gauge mid court clears.
After a couple of weeks, the string feels lackluster and overall, quite gross. They aren't kidding when they say the durability of the string is poor.