I have the original kit. All went well for over two years until I had some issues that customer support fixed after a couple of replacement parts sent. It was just out of warranty so very impressed with the service. However it’s now cutting out on me every ride after a mile or so. I suspect it’s the battery pack which, though a few years old, hasn’t done many miles as it’s my ‘pub bike’. I’d like to just replace it with a newer pack and controller but every time I look I can’t work out what I need to order as there are a number of options now. Mainly laziness on my part I’ll admit. Loved the product for the first few years though.