I have a Trek Marlin and I ordered mine back in early 22 and due to Covid lockdown in China orders were somewhat delayed so it arrived several months late, unfortunately this wasn't communicated without prompting, which was a bit of a annoyance. It was due in June and I received it in November. The kit its self was easy to put together and the instructions are fairly simple. I had to buy a new disk brake because the other wouldn't release off the wheel. It took me about 2hours to build, but that's mainly because I had to keep rechecking the instructions. I ordered the booster switch however because my frame is not round or straight makes finding a place to attach it is difficult. As is securing the battery mount. But it's attached that's what matters. Using it, especially with the nice weather, is quite nice. But the Range (I bought the XL pack) is stretching the definition. It boils down to riding style. Size of the wheels (I have a 28"), level ground and the power level. Even at the lowest assist level I might get 2 days travel and that's 12 miles on a single charge, bit of a far cry from the 25+ miles claimed. Perhaps others would have a better result with smaller wheel base. I found that I was having to get creative when cycling especially on day 2. I have it on a low power when I'm cycling, press down once more so its not using any going down hill. Turn it up too 4 when setting off from traffic lights before turning it down when at speed, and 3 on hills. It's no wonder they suggest a second pack or a spare charging cable for the 'Office'. It wouldn't work for me unless they came up for a way for me to charge from a 12v power socket on the vehicle and I don't fancy buying another battery until I need too. Worth the £600 I paid? Meh, while cheaper than a ready built, it needs more work on the battery capacity. However it does the job of moving the weight of my Bike and my sorry carcass along the road so Im not going to argue too much.