Never ridden a Rad machine, but have to assume they're good bikes.
Wife and I bought two of the Lectric XP 2.0st bikes a little over a year ago, and I continue to be impressed at the quality and features for the price. Reading numerous other bike reviews I keep saying to myself, "Okay, but it doesn't have a ...." over and over again. Really rich feature set and the components are decent quality. Bikes are a bit heavy, though, but to shed a few pounds you'd be looking at adding multiple $K for titanium or carbon fiber.
To me the biggest issue BY FAR facing the industry is fire danger. Every single battery and charger allowed into the country has to have a UL certification. The battery packs hold a lot of energy and are potentially very dangerous and extremely hard to extinguish; numerous major fires in NYC apartments, for example, and some cities are starting to simply ban ebike batteries indoors.