Disclaimer: I am an "EV enthusiast". I currently own another electric trike, an Arcimoto FUV. I also own a Rivian R1T electric pickup and a Ford Mach-E.
I've had a deposit in for an Aptera for years, and I'm one of the "small investors" who has stock in them.
At this point, I'm assuming that my deposit and my investment won't ever produce anything for me.
I hope they succeed, even if I wasn't an investor and deposit-holder. The idea may be kind of silly, and absolutely not for everyone (neither are motorcycles.) But they're always begging for more money to actually start production, and always failing to raise as much as they say they need.
At this point, I imagine the first few dozen vehicles will be delivered to the "high value investors", but that true large-scale production won't happen.
On the technical front - yes, the solar panels are largely a gimmick. Maybe if you always park outside in somewhere terminally sunny like SoCal, Arizona, or Florida, it might make it so that you never have to plug it in; but in most areas, it will make a small dent on your charging needs. The big "selling point" is the extreme efficiency. There are a few ways to measure EV efficiency. The EPA uses "Miles Per Gallon equivalent" or MPGe to rate EVs. By their measure, the most efficient vehicle is the Lucid Air Pure, at 146 MPGe. My Rivian is rated at 73 MPGe.
Most EVs measure efficiency in either "miles per kWh" (one gallon of gasoline contains 33.7 kWh of energy, so an easy conversion is to take this number and multiply by 33.7 to get the "MPGe") or "Watt-hours per mile" (inverted, so a lower number is better, this is similar to what many metric countries use for gas vehicles - liters per 100 km where a lower number is better.) That Lucid Air Pure gets about 4.3 miles per kWh of energy, or about 230 Wh/mi.
Aptera claims 10 miles/kWh / 100 Wh/mi. That is more than double the efficiency of the most efficient "full size" vehicle. My Arcimoto FUV, a similar "two seater three wheel EV" gets about 5 mi/kWh in mixed city/non-interstate-highway driving. The Arcimoto is great for city driving, and while it is absolutely capable of highway driving, it isn't very aerodynamic so its efficiency drops like a brick on the freeway. The Aptera _IS_ aerodynamic, so should be much more efficient on the highway.