3 modified helium sticks, one removable aider gets me to 20-21 foot easily. By using the water irrigation tubing it really is not hard at all to get my foot in the loop. Also, by having it hook on to the top of my stick it is easy to pull it up and put my foot in for leaning trees.
I used this system exclusively last year and really have no plans on changing. I will still buy a set of Dan Infalt's sticks when they come out just because I want to support him and they are really nice.... but my current stick setup I have been using for 5 years now and they work on every tree I have ever climbed. At just a tad over 6 pounds, and attached to my pack, they are super easy to carry and get through the brush. And having climber literally 1000s of trees with them, I can use them in total darkness by feel and without making a lot of motion or noise (yes I practice this as well).
Totally happy with my set-up at this point. Could I get creative and shave off a pound -perhaps? but as I have said many times, the easiest and most productive weight savings for me has been the real estate just north of my belt.... down 35#s this season and still room for another 10 before Oct 1st.