As you know I am carnauba less, so I am still with my acrylic sealant and although it doesn't bead too well but sheets great (but ofcourse needs a force for that like going at a speed or free thick flow of water to drive it all off while washing). It too seems to hold up well although only exposed to a couple of rains only but a wash and it looks as good as freshly sealed MashAllah...
I did try Duragloss Aqua wax on my brother's car (which is due a thorough detail but applied that after a wash during ramzan). That car is a daily runner and even stands direct under rain at night. It has been beading up well although not as tight but still beads everytime it rains and hasn't been washed even once (the rain just doesn't stop 
Collinite as LSP I believe is a champion at getting you through the season.
About collinite 915, I read its "preferred" for the solid colors mainly as it mutes flakes possibly due to the higher carnauba content than its 475. For silvers, 475 or 845 work well. Thoughts?
Which color do you have (if its any different than detailer's first choice black) ?
Ofcourse, collinite's require expertise for applying thin and removing them but a lot of people also apply them in a WOWO manner overcoming that hurdle and still getting almost the same outcome.
