I use pretty much all Sonus stuff. From gloss shampoo to WW towels their stuff is great. I especially like the professional applicator. It's alot bigger than other apps. and alot stiffer which makes it easier to handle. I have Sonus leather cleaner and conditioner but haven't used it yet. When spring rolls around i'll be on that. It looks good though; easy to use not annoyingly thick like megs leather cleaner/conditioner. Yuck!
I also have tire gel-it's awesome. Leaves a nice deep black, but not slick or shiny looking.
I would also say that the paintwork cleanser is one of the best i've used. leaves a slick surface after you clay. Preps the paint perfectly for sealant or wax.
Overall, they make good stuff, I really like it.