We have two Swytch kits on bikes already and thoroughly enjoy them . When things go wrong some of the customer service agents are utterly useless but luckily others are excellent. The delivery time has never been respected and both arrived over a month late. The third Swytch kit arrived over 2 weeks ago without it's battery and we are still waiting - customer services said it would be sent out asap , I just hope that doesn't mean months. As tothe functioning of the kit the recurrent problem is the pedal sensor getting knocked when the bikes are stored against each other or on a car bike rack, 1mm makes the difference between go and no !