I have used the ultra, they are first cousins, I found it somewhat complicated to spread it, you have to get the hang of the damn brush XD. Regarding temperatures, more than one will call me crazy, but I had the same as with artic silver 5 that I already had on. Therefore, seeing that the amount of paste is very scarce for its price, I do not recommend it.
Apart from that, I had problems with the water block, it fixed itself in such a way that it became part of the same block, I don't know if I can explain it, it got embedded in it, so that you could run your finger over it and it was totally flat.
In the end, I had to polish the block because there was no way to clean it :wall:.
PD: Recently I saw a comparison of thermal pastes and there were only two pastes that managed to improve artic silver 5 after its curing (200 h). And they were comparing I think 60 pastes, so it's not a joke.
It is also true that the mounting of the heatsink/block influences, in each mounting you will get a different temperature, that's why we must take our time to get the best possible one so that we don't have to keep testing continuously.
Best regards.