I prefer universals because, with comply tips, they're more comfortable, better isolating, and you have more control over the sound's pathway (i.e. you can lengthen or shorten it). Not to mention that they're much easier to sell.
I go the opposite. As much good as you get with adjustable tips, it's also my source of great frustration. Specific to comply foam tips if I insert it too deep, it muffs the sound, a bit shallow then it falls off. If I get the right depth as soon as I take deep breath or yawn it comes loose or just pops out. Considering the size and weight of the universal Roxanne, it will be nightmare for me.