I have owned the predator since they came out and had quite a few hunts with it. I had not problems with it other than me WANTING a larger platform. I also own the ambush.
I believe the predator is a more flawless design and was tested better working out the bumps along the way(other than Gen 1 breaks). The ambush is a good bit larger and for that, I have stuck with it. I do not believe it is insufficient in any way, but I do believe the predator was better thought out.
On the ambush, I can easily stand and add a layer if needed. On the predator, I was not able to stand straight up. Sure it's a couple pounds more, but I will carry it everytime I head into the woods hunting.