I like MX2. It's fairly easy to work with, provides good all-around performance in a variety of cooling setups, is affordable, and as you say long lasting. I used to say the same about Arctic Silver many years ago but MX2 eclipsed it some time agn the other side of the spectrum, some of these "less mess" high viscosity compounds are a PITA to work with and/or require a lot of clamping pressure to get good results. No thank you.hotroderx when they do the test, I hope they also do a longevity test. Arctic MX2 from my experience has very good longevity in hot environments and good performance, others such as Coolaboratory Liquid Ultra and possibly others do not, thermal conductivity takes a dive over time
I seem to recall THG did this a long time ago for heatsink tests. I can't recall the specific reason they stopped. No doubt there were issues, whether it was accuracy problems or just wanting more real-world numbers.I'd rather see a test in a controlled environment using some kind of custom hotplate. I think this would take out a lot of the variance in testing and provide the best scientific numbers for the thermal conductivity.