I own and have used, in order, the ErgoPlay, Gitano, Dynarette and NeckUp. The two that I have settled on are the Gitano and the NeckUp. I found that I had to do some bending to get the ErgoPlay to fit me, plus I found it unwieldy and, because it is metal, made me nervous around the guitar. The Gitano, while also being metal, is smaller and much easier to transport and use. Since I can leave it on, I feel much less nervous about using it. The Dynarette would have been a good solution, except that I found it tended to shift around too much. The NeckUp is like a leather Gitano but with much more adjustability. However, if you do not get it tightly strapped, it can feel a little loose and insecure on your thigh. I have not tried any of the others, so cannot comment.
Hope this helps,
P de V