I use one of the Hunter's Safety System harnesses - cost a bit over $100. It's a bit heavy, but it is super quick to put on and adjust, and it is comfortable. I don't see it on their web site anymore, but the closest approximation would be their
Hanger Harness.
The only thing I don't like about it is that the lineman's loops don't have rings in them, they are just loops of webbing - which is true for most hunting harnesses. When I'm climbing a tree and constantly clipping/unclipping the lineman's belt when traversing branches, it can be a pain.