I've been following this thread for a while and was prompted to make my first reply here because I think you're over complicating this. I'm 52F and bought a Tennis Tutor Cube in November, my first ball machine. The Proton looked awesome, especially compared to the old tech used in all the other machines on the market, but since it wasn't available yet and I wasn't sure how much I'd use a ball machine over the longer term, I decided to go with the Cube. Chose it because it is very portable, reasonably priced ($639 as a demo from the manufacturer), and I knew if it was a pain to get set up and cart around then I would definitely not use it as much. It has a realistic level of topspin and oscillation. It's a great machine for my needs, and my game has improved a lot in a few months, as now I have a way to practice what I'm learning in my lessons. I love the fact that it's so small and portable because sometimes I want to use it for 20 minutes to warm up before a match, or I'm just short on time but want to get 30 minutes of hitting in. Honestly I probably wouldn't get something like a spinfire or lobster out for a quick session like that.
The Cube is 25 lbs and pretty small, 12"W x 12"D x 15"H, but awkward to carry. That said, I too am used to hard workouts and it's not a big problem for me to carry it out to the courts. If I have to go very far, I just put it on top of my ball hopper with wheels and wheel it along (will try to attach a pic). The Proton is smaller and lighter, and I have no doubt you could do the same with it if you don't want to carry it on your shoulder. I have a backpack to carry my gear.
When I got the Cube I figured if I used it a lot and felt like I needed something more, I could sell it (they have good resale value) and get a Proton later. I still might do that as it would be awesome to set up more complex drills to repeat. If it doesn't do lobs, that's a disadvantage compared to my Cube, but maybe there's a way to rig that up with the Proton (?). Except for that, I think the Proton looks awesome and will be even more portable than my Cube.