I bought the numatx at the beginning of the year. I chose it for 2 reasons. First, it was just about the same price as the pneumatic squeezer. Second, I liked the ide to operate it with a foot and not have to have my hand ready to depress the trigger.
To be honest, I hated the numatx at first. My dimples were terrible and the rivets were bad. I was so frustrated that I was about to throw it away (or maybe sell) and buy pneumatic. I stuck with it and realized how to set it up correctly. If I had more experience going in then I would not have had the issues I had.
Now that I have my unit set up correctly, I love it. What I like the most is how light it is. Doesn't matter how many rivets I do, my hands never feel tired.
About dragging it around and the foot trigger. I mounted everything to some MDF, as others have shown in previous threads, so it is easy to push it to the corner of the shop. When driving rivets or dimpling I get the pedal positioned, usually sit on a stool, and I can rip through the work. The foot pedal is easy and you can feather it, with some practice. I am on the HS so I haven't gotten far and haven't had issues with the pedal. I am curious what is going to happen if I need to climb inside the plane and start riveting.
To sum up my experience. Steep learning curve, but you can do it. Just take your time. Best used from a stationary position (sitting) but you can stand. Lighter and easier to handle. pedal may be an issue later in the build when you need to get into tight spots.
If I had to do it over again, I would get the numatx. Would be nice if it also has a finger activation as well. Oh, and get the lightweight braided hose form Flyboys.