I have to say that I think that paying for favourable reviews on Amazon and similar (which is what this is) is not a particularly ethical way of doing business as far as I'm concerned. Many folks like me read the reviews before we buy stuff and if someone writes a glowing report on a piece of junk because they have been paid to do so, and on the strength of that someone else buys said piece of junk and finds out that it is a piece of junk they can get lumbered with it. I'm not saying that Inkbird stuff is junk (and I speak from personal experience of using their stuff) just that, in my view, they should not be buying reviews by dangling free controllers at forum members, whether they are sponsors or not.