I have one of their lock ons. I do not remember what model it is, but It has a very large platform, which I like. The seat is ok. Average at best. I have had it in the same tree for 3 years now. No problems. Fairly comfortable. Great price.
I would purchase another. Most of my lock ons are on public land, so I have trouble hanging and leaving an expensive lock on there. I would rather lose a cheap on instead of an expensive one. If I want total comfort, I will bring my Summit climber.