OK so before i start i am going to come out and say i "do" have an association with AB and I "didn’t" pay for this chain lube. So if you want to ignore my following comments then feel free to but they are genuine.
I fitted a new chain at the beginning of last month when i built up my new Emonda SL and treated the chain to the AB lube exactly as per the initial application process. This is quite a lengthy job but worth doing for the initial application. My first thoughts when riding for the first time was the chain didn’t sound much quieter but the gears did shift very smoothly. As far as the "watt" gain then I really can’t quantify this, i saw no numbers on the PM that made me think there was any real change but then again I wouldn’t expect too.
Therefore I can only really comment on the longevity of the lube. Since the initial application i HAVE NOT applied any more lube to the chain. I have now clocked over 1350 miles in the past 5 weeks and the chain has become "dirtier" in appearance but still shows no sign of needing to be re-lubed. Chain is as quiet as it was on day 1 and is shifting as smooth as I would expect. Living in England we hardly have good weather so i would say around 300 miles has been in rain and probably another 200 on very wet roads. Roads around me are also notoriously dirty and badly surfaced due to farming.
Chain lubed and fitted but with 0 miles covered.
chain still with origional application and at time of photo 1300 miles covered.
So is it expensive? Yes its stupidly costly, i cant argue with that however with over 1300 miles covered on a single lube its likely to see over 22500 miles out of a single bottle. So lets say you buy a bottle and use it just for your summer / race bike (because it shouldnt be used in winter due to the low temp) then its likely to last at least 4 - 5 years even for a rider clocking up over 6000 miles a summer? So then if the supposoded Watt saving is true and the reduced wear to your drivetrain is to be believered (i dont see why it shouldnt given how transparent they have been) then it might not seem so stupid?