Only a 1 year warranty...that would concern me.
Please tell me this is sarcasm?
Because a heat pipe cooler either works forever until you damage it so the gas inside escapes, or it doesn't work from the getgo, because the heat pipes are empty.
And if your talking about fans, i can say without a doubt, only Noctua honors warrenty on fans dying, but the fan needs to be not clogged with dust, and has to be a genuine motor fail.
All the other vendors will basically laugh at you if you try to RMA a fan, and it will be on the mood of the Customer Support department, to replace it or not.
i've found that generally trustable sites like gamersnexus et all, can have varying results when it comes to cooling.
Its really difficult to do an accurate test, because during every test to have a fair comparison, you need to hold environment constant.
That means you need a temperature controlled room, and you need the same test bed for all the test.
You modify one of those, the accuracy on the comparison will be skewed.
GN tries hard to be as accurate by doing so, and so far i feel they are the closest in accuracy.