If your disc gets stuck in a tree 2m or over above the ground it is considered OB and you get a penalty stroke. Play from directly under where it was in the tree.
I hate to be nit-picky, but when the rule is in play, your disc being suspended 2m or more above the ground IS NOT CONSIDERED OB.
OB and above 2m are two separate things with two separate rules and two separate means of dealing with the situation. The only thing they have in common is that they both come with a one throw penalty. /endrant (nothing personal Jay, just a pet peeve)
IMO, the 2-meter rule as it currently exists is the best of all worlds. TDs that want to use it may do so, TDs that don't want to use it don't have to, and TDs who fall in the middle and think it works in some instances but not others can use it selectively and judiciously.
I'm in that third boat. The 2-meter rule is a design tool just like the OB rule or the mandatory rule. It can be used judiciously to enhance the design and challenge of a hole when it is put in place specifically for that hole or just certain objects on that hole. It can also be implemented poorly and unnecessarily...which is usually the case when it is declared in play for an entire course. Sure, it works great for that one velcro-like cedar on the green of short little hole 7, but why does the oak tree 25 feet into the woods off the fairway on 500 foot long hole 16 need to carry a penalty for a disc that happens to get stuck 201cm above the ground?