It is a little early to tell you, but I think I will like it very much when I actually use it yet. I was out of the country until September 24. On that day (just 2 days ago) I was able to work on installation. I was not as satisfied with the instructions for assembly as I had hoped. First of all, I enccountered many challenges. One is that when I put the wheel on my bike, the disc from the disc brake system did not fit exactly even though I tried to tighten the bolts on each side of the axel to get the disc in the middle of its home. More on that. 2nd the magnetic disk assembly is very challenging to install and get to be perfect as the petals turn and the retention ring requires hand strength that a 77 year old person such as myself has a little bit of trouble to manage. Eventually I got it on, with only one cut on my hand generated through the process. 3rd. even though the space between Petal Arm and bottom bracket shell was much more than 4 mm (it was about 11 mm), I still could not fit the petal sensor stick into the space without taking off the little things where the tighting screws would have attached it. I solved that problem by getting strong double sided take (Gorilla 2-sided tape) to attach it to the bike frame and by adjusting how the leg of the device was attached to the arm with zipties, I was able to line it up was that the disk turned very close to parallel with the sensor. Also, the battery when attached did not leave a lot of room for my water bottle (especially I wanted to actually take it out of the water bottle rack), certainly not the one that I had on the bike, and after thinking about options decided to purchase a hip water hydration pack for future use. Together these challenges took many hours to figure out and honestly required some "jury rigging" to complete. Because of the issue with my brakes I went to my bike shop (which is very good) and they adjusted my disc brakes so that there is no rubbing (but the repair technician told me that it would not have been possible to make the adjustment just with the side bolts alone, he needed to use the adjusting screws on the disc brake assembly to get it perfect, which was beyond my expertise. The bike technician was the person who recommended the alternative hydration solution, other than a water bottle on the frame. My recommendation is that you create a section of solutions (at least on line) for the specific issues that I had as well as others that you might know about. I am sure that you know of all of the specific things that people call you about for help, and to create a good place to get ideas for the solution of these problems Last point: I have not tried the bike on the road yet becasue we have had constant rain from the day I returned to the US until today. I hope to get on the road soon, and I am pretty sure that I will like it. The 4 star rating is primarily because of the complexity of installation. When I watch videos it seemed so easly, and it is not. I was trained as an engineer, and believe that helped me figure out solutions to my challenges, but it took me a very long time, and lots of failed attempts.