The side rails didn't exactly match up with the gutter. There were a few gaps in some places. A bit disappointed that all the hardware is SAE and not metric- might consider switching the gutter mounts to metric hardware in the future. Can't seem to position the gutter mount bolts in a way to prevent them from dragging on the door weather stripping either, will consider a hex drive headless set screw and a locknut.
This thread has some good info in installing the gutter mounts with a leveling washer. I have some (not pictured) and would recommend installing these.
Another Prinsu Roof Rack mount option