I have a 2009 R1200GS and am considering Denali lights.
Any insight into installation would be a great. Hopefully a truly plug and play affair as I'm not into any cutting/splicing of the original wiring harness.
Yes, a true plug and play install if you purchase the controller as well. Have just installed a set of S4s and also a set of D4s with the controller on my 2019 1250GS and they work like a charm once you program them with a computer. I would buy them again.