First, that thing is expensive for what it is. But it works and it’s exactly what I was looking for. The problem is that they use a 8ll/15 speed shifter which means that you can’t use the splitter on the high range. If you want to use it as an 18 speed you will have to modify it like I did. Very easy to do, you just need some kind of grinder. Dm or comment if you need some help.