I've never ridden the SFB or the Opus, but I've spent a lot of time on the Bent Chetlers, and I own Hellbents.
The Chetlers are pretty comparable to the to the K2 Obsethed (if you've ridden those). I feel as if the Chets are stiffer under foot than the Obsethed. For hitting drops, cliffs, cornices, etc, the Chetler is a great ski. I feel it just lands better better. I do feel like the Obsethed turns better, and it's a much more "fun" ski. Both kill it in wide open powder.
The Hellbent is overall a super fun ski. It can handle pretty much any condition, and it's afraid to go over anything. I feel as if I can land anything, and am not afraid to straightline anything. It's quickly turning into my everyday ski, and I ride it on anything except park. The large amount of rocker, and softer flex lets it ski up and over anything, and when you point it down hill, it just goes. Be sure you put a little muscle on those chicken legs if you have them. The Hellbent is a big ski, and sometimes can be some work to move around.