The FRX 1 80 with 80 bass notes in memory is lightweight at about 6 kg. I’ve seen and heard it played—it sounds great—and it has a USB port for backing tracks, etc.
Next is the FRX 3, which also has a USB port, 120 bass notes, and the option for chromatic bass notes, a left-hand drum, etc., weighing around 8 kg. It’s quite different from an acoustic accordion—the feel and control of the bellows are different, although you can adjust them. I’m no expert on these accordions—I’ve only seen and tested them for a few hours. The advantage is the wide range of sound options—musette, swing, violin, trumpet, etc.—you’re spoiled for choice. Built-in speakers with volume control, a built-in 10-battery pack and AC adapter, MIDI, the option to use headphones to play without disturbing the neighbors (very useful for apartment dwellers like me), etc. There are enthusiasts who wouldn’t trade it for anything, as well as those who are undecided and those who are against it. As an intermediate instrument for playing at any time of day or night—and then switching back to your acoustic—it’s the best; no time wasted. Plus, since it’s lightweight, it helps with back problems (like mine)—lower back pain, sciatica, etc.But as long as I can also play my FRATELLI CROSIO 96 Bass—8.5 kg, 5 MD registers, and 2 MG—I’ll keep doing so. It takes time, but you have to try it out and see what works best for your needs and budget; in any case, it’s the cheapest digital bass out there. I’m neither an expert nor a pro—the choice is yours. Musically