I have a pair of convertibles from Campmor, but I don't like them for a few reasons.
First, it's a long story, but I like my shorts knee length, I've yet to find ones that long. Second, I found that a pair of windpants and light shorts were lighter than the convertibles. Third, I like the idea of having separate shorts and pants in case I want to go swimming or get wet. Sure, convertibles can dry fast, but when there's no weight penalty for having both why bother? Fourth, it seems like most convertibles aren't wind resistant. Someone said that didn't matter to them, but I find that if it gets really windy then that makes a huge difference in keeping me warm, even with a pants length base or insulating layer. Most people here agree with the utility of a windshirt, it's the same for your legs. I find I need less insulation for my legs, but something that blocks wind gives a lot better warmth to weight ratio in windy conditions. Lastly, there is a privacy issue, but I find it takes me no more time to change my pants than it did to zip up my convertibles.