Idle temps are now near ambient and longer full load torture tests are between 2 to 3 c lower than they were on my previous arctic 5 paste.
Would I recommend it / Is it worth the extra cost?
Dubious, more than double the price for a 2 to 3 degree reduction under stress load.
It is better but not by much... certainly not 10x better (which is what its thermal conductivity rating is over normal thermal paste conductivity ratings) but sod it, I will take it.
You can get cheaper with little loss in pref(Thermal transfer), that being said I do have kryonaut for my main rig with custom loop. I have cheaper stuff for everything else. Its 100% not worth the money, but eh if you have the money to blow it is measurable results.
Thermal Grizzly is used very frequently in the competitive overclocking world due to it working well with LN2. I've also heard things in line with what Zavar said in terms of temperature differences around 20 degrees celsius in laptops when paired with undervolting.