Really happy with our Swytch bike, when it finally arrived (delivery was a couple of weeks outside the window for one bike, and still waiting for a second one 3 months late and counting). Customer service were very fair, however, and refunded us the extra we'd paid for early delivery, but a bit disappointing. A query we had on the installation (part of the kit, the magnetic disc didn't seem to match what was shown in the manual) was quickly responded to. Now the bike is going and it is really good! Very happy with the operation and performance (I'd say the optional display/control which we got is essential for varying the assistance level according to the terrain) and the installation was easy if you are used to bike maintenance. It was a bit of a struggle to organize the wiring as there is quite a bit of spare cable to loop around neatly - inevitable as the kit is designed to fit on a wide range of bike sizes. We got the Go+ battery and it is rather heavy to take off and carry around whilst the bike is parked in town, but the velcro straps would be easy for a thief to undo and steal the battery if left on. I see they now offer a locking mount - I'll have to investigate that.