I saw a linus tech tips vid where he tested this https://www.amazon.com/Innovation-Cooling-Graphite-Thermal-Pad/dp/B07CKVW18G/ref=sr_1_2?keywords=IC+Graphite+thermal+pad&qid=1552162413&s=gateway&sr=8-2&tag=linus21-20 thermal pad and it didnt seem to shabby. Have anyone tried it and how was your expirience with it?
Thermal Grizzly is releasing their own version of that called Carbonaut. It should be coming out soon™
From review videos I have seen it works as well as a mid rate thermal paste but has the advantage of being reusable over and over again. From mid rate to top of the line thermal paste you are only talking about a couple degrees at best difference anyhow so I don't think that is deal breaker on it.
I would still use the thermal paste that comes with my cooler as it will often perform around the same if not a degree or 2 better (since high end coolers often give better thermal paste). If I run out of thermal paste and only need it for a single system then the thermal pad seems like an attractive option. Though it can't be shared with multiple PCs a tube of thermal paste can cover multiple.