My Swytch kit is one of the best products I have bought in ages. I was not sure what to expect, so my expectations were pretty low. After I got it set up I was blown away. I had a decent Giant E-bike pre-2010 and I was pretty underwhelmed. It had a 250 watt motor on it. So I thought the Swytch kit might be underpowered. Not-at-all. The new sine wave controller makes it super buttery smooth and silent. Power is fantastic. (I wish the top end speed was a hair more - that is my only complaint). The battery pack mounting system is beautifully designed. Swytch crushed it on providing both form and function. What put me off with most other add-on kits is that they just look dumb. Swytch actually added cool-factor to my bike. It just enhances the capabilities of my bike, while maintaining the feel of a regular bike (unlike some of the other monsterous ebikes out there). Needless to say it has my vote!