Got'er installed on my 06 950 SM. Was actually easy to do. I took my time and didn't disconnect anything from the carbs. Just pulled all the lines up through the bottom of the air box and pulled air box out with all the carb stuff still connected.
Starting off with the following setup for SM Sport Riding and tuning from there.
Part Factory Pro kit and Part H2W kit for my jetting
Main Jets 170R / 168F
Pilot Jet #45
Needles Factory Pro Ti needle 4 position from top
IMS screws 2 turns (Flex-Jet installed for easy adjustment)
Air Jet #70 as supplied by H2W to replace stock #50
Float Height 3.5MM