I have two e-bikes. One is a RadRunner 2 and the other is a Kona Dew. Granted both of these are for commuting around town vs using them in the mountains but I'll happily give my thoughts.
Rad does create a good bang for the buck bike. The hub motor is powerful and the welds are solid. That said - they skimp in some critical areas for ultimate backcountry reliability. Number one is the brakes, they use cable disc brakes which for a bike that heavy wear really quickly and don't stop you fast enough. The second is the hub motor - since the motor is in the rear wheel - if you get a flat, it is a total PIA to change the tire because you have to disconnect the motor and bolts etc etc to get the wheel off. Lastly, Rad has 0 customer service. No phone number, no real people and no help (basically no warranty) so you should take that into consideration as well. But - still good bang for the buck.
My Kona was purchased through my LBS. It was double the price of the Rad, but I feel it's much for a Buy it for life purchase. The mid drive motor is way smoother when riding - it actually feels like a bike when riding it vs a moped. This gives me much more confidence on it. It has hydraulic brakes, reliable components and drivetrain, and a great warranty through both Shimano(Motor) and frame (LBS). If I were to do it again I would just buy the Kona.
My 2c