I have a Rambo and my GF has a RAD Rover. If I had it to do over again I'd go with the RAD. Four main reasons - The RAD has a 14ah battery where my Rambo 750 (actually 749 to comply with federal and state laws on non-motorized for Class 1 and 2) while the Rambo has 10.5 ah. The RAD has about 2" higher pedal ground clearance than the Rambo. The RAD has front shocks where the Rambo doesn't. And it costs $1,000 less. They are amazing tools. We take ours into places where no other vehicle can go because we can easily lift them over or pick our way around deadfall and negotiate over and around rocks. Both will literally climb up or navigate down a rocky chute if the rider is good enough. There is definitely a learning curve in how to ride them safely in rough terrain and how to manage the battery (shut it off on downhill, or drop the assist to 0). We keep our tire pressure at 10 psi which makes for a very forgiving ride.
As far as legality, Colorado law declared them as non-motorized and the CPW does not have a policy currently on state land. I spoke with the head of the trails division for CPW and he said he believes they should be legal wherever regular bikes are allowed. Same answer from the USFS Regional Trails supervisor. He said he is all for them because they keep people out riding who otherwise wouldn't because of age or injuries, because they are "green", quiet, and do no more resource damage than any other MTB. He said the USFS is reviewing the policy and running some pilot programs now where they are allowed. He believes it's only a matter of time until the TMR is revised, but the federal bureaucracy moves slowly. He also told me he doesn't know of any citations being written on USFS trails. The county where I live has some huge foothills open space areas allowing horse, foot, or bicycle, and they are legal there. They are growing in popularity and are here to stay. My GF remarked the other day that if ATVs and motorcycles were outlawed but e-bikes were allowed, the mountains would be a much better place.
Ok, I'm 64 with a metal hip and a bad knee and still bowhunt big game solo for 70+ days a year. I've gotten grief from people who think riding an e-bike is cheating", but who have no problem hiring someone to pack them in and out on horseback. That smacks of just a little hypocrisy. So far all my riding has been either on private land in the mountains or on USFS trails open to motorized vehicles but impassable to ATVs and motorcycles due to deadfall patches that the USFS doesn't clear. But come hunting season I don't think I'd have any qualms about riding in on a closed USFS road open to regular bikes. USFS TMR policy is not law", but rather arbitrary rules enacted by unelected bureaucrats that can be changed at any time, for any reason. My GF is a lawyer and would love to test the TMR rule in court, as do several other e-bike riding attorneys I know.
Confused me there briefly!
