The lone wolf with screw in treesteps is a deadly combination. I've gotten away from climbers just because they are too heavy to tote in.
Personally, I use a gorilla silverback (8 lbs), and carry 8-10 screw in steps in the back pack of my seat of the pants climbing harness (probably another 3 lbs) I can screw in the steps on the way up the tree with the stand on my back, set the stand, climb in it, pull all my gear up, and be ready to hunt in half the time it took with a climber. It's also a LOT quieter using treesteps. And you get the versatilty of being able to hunt smaller diameter trees, not having to trim out limbs, etc. I just unscrew the steps out on the way down.
Once you use this system, you'll never go back to a climber.
I know several guys who use crampons and a climbing belt instead of the tree steps and that works as well. I'm just not proficient at using crampons, though.