I have had them on 2 bikes and they worked great. If you understand their limitations, they do what they are supposed to do. Had them on a 15 Ultra and 10 Deluxe. Both were slip-on only.
I worked with Steve on a few proto types XIEDs for the new bikes. We had lots of issues with the check engine light coming on. Apparently Harley made some changes that are difficult to overcome. I've had several of the earlier models he produced. Maybe he's overcome those issues by now. You should call him directly and ask.
I did install the adj on my 2017, seemed ok at first, than created a real problem and had to have bike reflashed. Have since used the PV-2 and all is great. The xied worked ok on my 09, 11 and a starting point on the 14.