I have the air cooled tendon boots. They are nice enough. A bit diddly to put on though as the elastic isn't very stretchy. And yep air cooled means that there are sort of meshy bits at the sides (away from the strike pad bit over the tendon itself). I've only really used mine lightly for competitions and they still look good as new apart from a few scratches.
Have the KK3 event boots. Liked because they have both tendon strike pad on fronts and cannon strike pad on backs which not many others have. Look out for the daily deals as they come in at 20% off.
i have the event boots and they are still around after 2 seasons of competing, and they fit my TB very well, which is something i've struggled with a lot