What we mean by that, is after hours, weeks and months of use in the extreme condition that RC bashers and racers put their RC cars and trucks through, CowRC products always tended to outperform the competition.
For example: CowRC Udder Butter was tested by us and others in extreme temperature variations. Here on the West Coast, morning temperatures on race-days can be in the low 40's in the morning and track temperatures can be well above 120 degrees by noon and when you couple that with the high-performance motors and ESCs blasting out huge AMPs of power through a drivetrain, very quickly you can have failures in bearings, diffs and transmission gearing. CowRC's Udder Butter grease is not only waterproof and does not break down in water but it also tends to have very little "throw-off" on Ring-Diff Gears and other transmission parts resulting in the lube actually staying on the parts even at high velocities. This results in extended life of your gearing in addition to very limited issues of with gearing failures cause by excessive heat and abuse caused by the elements and terrain.
Here's a tip for you, It should be noted that most failures of ring and pinions are not caused by the lube failing, but the lack of proper shimming on the pinion on the ring gear. So always try and eliminate the slop without making it to tight against the ring gear.