Had actually picked up one of the Green 6-Hours warmers from Amazon right before these dropped here. Had got it for my wife, but Dang!, I want one (or two) now as well.
Does get quite warm on High. Great for jacket pockets where you can send your hand in for a warmup, then back to work. One for each side would be great. And let me tell you, if your jacket has inside pockets, this works surprisingly well for adding heat to the interior of your jacket and your core.
Will definitely be picking up more of these 6-Hour warmers.