Let me start by saying that once I got it installed and running, I was VERY satisfied with the Swytch riding experience. It is EXACTLY what I was looking for - a power assist on the grades. It works seamlessly - but the installation was anything but. The first wrinkle was just getting the motor wheel itself installed: my Trek FX2 had a through-axle fork, and the Swytch only works with a bolt-on. So the first thing I had to do was replace the fork. I also had to replace the hydraulic brake rotor AND find an adapter for the hydraulic brake caliper. I had to have it all done by my bike shop and it cost about $300 on top of the cost of the Swytch kit. When I got to setting up the rest of, that was a series of complications as well. It was not clear how to clamp the magnet rotor on the crank shaft; the sensor did not fit between the frame and the rotor until I decide to saw the mount off and secure it with wire ties; likewise, the mount for the LED controller is too small for my handlebars and THAT had to be wire-tied into place too. Finding the necessary instructions was a bit of chore, too, because there are separate manuals for separate components and of course everything is online. No actual "manual." But... somehow... through grit and perseverance (and entirely too much gnashing of teeth) I got it all set up and went for a test ride and... THAT was a REVELATION. It's effing MAGIC! The damn thing seems to work perfectly. With the LED controller I can turn the motor on or off, or leave it a minimal input until I get to a hill and then... Hill? What hill? I will go for my first serious ride with it tomorrow, and I'm quite looking forward to it. I would have given the whole experience 5 stars for the end result, but the installation was at best a 3 so I settled for 5. But based on my little bit of experience with the actual ride so far, I have to say the 5 is definitely worth the three.