We just upgraded to a 2013 Arctic Fox 1140DB from a 2000 Lance 1140 and had the fastguns included in the package. What an improvement over the old school turn buckles! The locks were a no-brainer because of the replacement cost of the tie downs.
Just got the new camper a couple weeks ago (maiden voyage to Ocean Shores this weekend) so haven't unloaded and reloaded it yet as the Lance is currently occupying my RV shed, but it's got to be a huge improvement over the turn buckles.