The weight seems like a major disadvantage to me. Amtrak and airplanes have a 50 pound weight limit and even loading a Rad on a bus rack can be problematic.

If you like your Rad then you might not want to try a decent mid-drive bike. The better ones ride basically ride like an enhanced version of a standard bike. On declines and level terrain it's doesn't do much, but steep grades are so much faster it's a blast.