The cycle tracks are really good and better than a lot of roads. There is a short rough bit just after the Paisley Cancel station but it soon smooths out.
The route is a steady climb to Portal Glasgow and a quick turn around and back again. Had to slow quite few times due to kids, dogs and the old blind person not paying attention to my ringing bell.
My Bike is BMC Streetracer SR02 and coped well with the trip. I don't cycle as often as I should or would like.