I've had the bike all summer and used it quite a bit; it's a comfortable bike, especially for urban dirt trails. However, I wouldn't recommend taking it on a real mountain bike trail. I installed a rack on the back and strapped a milk crate to carry my waders, boots, and gear. I use it frequently to get to fishing spots and as a shuttle on raft trips. I've never pushed the battery past around 23 miles, and I'm not sure how many more miles it could go, given the bike's weight. That said, I don't pedal much when riding.
There are a few things to be aware of. The top tube is higher than you might expect, which can make mounting and dismounting tricky if you're not paying attention. If you have shorter legs, you might want to consider the step-through model. For reference, I'm 6'1 " with a 34-inch inseam. My only other complaint is that the bike isn't designed for easy installation of accessories. There's no place to install a water bottle cage, and finding a fat tire back rack that would work was a bit of a hassle. I would suggest that Retrospec invest some time in offering compatible accessories