Got a rare 50 degree sunny day in February here in VT so I took the 9 out for a rip. While I've done some minor rappelling here or there in my 50 year life, I am a newbie when it comes to doing such from a hunting saddle. I know that being a couple years late to the rappelling party around here makes this sound a little foolish, but holy cow Batman...THAT is a lotta fun! I guess I was too enamored with my custom built sticks to just bring one in the woods, and I never saw the logic in rappelling when there were 3-4 perfectly good sticks to climb down.
Anyway, back to the 9. I was actually a little dubious before giving it a go, mostly because it is heavier and bulkier than it looks on a screen. I also have an ATC and at 7 oz for the 9 and 2 oz for the ATC, it seemed like a no brainer as to which would win the comparison. Not so. While the ATC performed exactly as expected, I just didn't like relying entirely on my break hand (with an autoblock to my LB) to control speed and start/stop. The lever action of the 9 gives you two points of control (assuming it is backed up with an autoblock to LB). The handle is so intuitive to pull with slight increases in tension to begin to descend. Wanna go faster? Pull a little harder. Wanna slow down? Ease up. Wanna go hands free to remove stuff? You confidently do so knowing the 9 and the auto block have you twice protected against slippage.
One pucker moment that is worth sharing. I think it was on my second descent I got a little aggressive and the rope slipped through pretty quickly before I caught myself. I didn't fall very far but it got my attention! I think what happened was that I had a full grip on the 9 and a full grip on the autoblock, and when the initial slippage happened my instinct was to squeeze both hands (maybe to catch myself?), which of course allowed much more rope to pass through the system much more quickly. Somehow one of the hands must have let go because I stopped and sat there catching my breath. It occurred to me that it is probably a bad idea to grab the 9 in your full hand. Kind of like don't test an electric fence by touching it with the palm side of your hand (so your hand doesn't close around the wire reflexively, for those that don't know this one). All remaining descents I just used the ends of two fingers (which was plenty) to engage the lever for descent. Several times I tested forcing a rapid slippage and just snapping those fingers off the lever, and bam! Stopped immediately every time. I even tried it with the autoblock loosened and squeezed so that only the 9 was going to catch me (though in my mind I was prepared to release the auto block if SHTF). Worked beautifully.
So....it was only one fun day of testing, but the 9 will be back out with me when we get rid of more of this snow and cold. The utility of the handle is worth the 5 oz difference compared to the ATC (as well as just using a biner/munter). I like that it is not mechanical in nature, is rated for 8mm rope, and was inexpensive. I wish it was a little smaller, but it's not a barrier to incorporating it in my system. I did not climb or hang with it on my tether, as that seemed like too much metal/weight/bulk. I just used a regular friction hitch for that and then installed it when it was time to rappel. Easy to do.
TLDR: The figure 9 works pretty well as a belay device. Even for this old and fat novice.