it depends where you buy it...2 and half times the cost at least ....... is it that much better ?
greasing trimmer rotor bearings takes about 1 cartridge ........i usually push a bit more in at lunchtime as well could get a bit pricey.
36 of them would cost me about £120, for that price i personally think its worth it.
on the other hand there are plenty of folk who say oil is oil and thats their choice, i like it as a grease having tried a few.