I wore them all the time in the military and found that they are great for some things and really lacking for other things.
If you're going to be moving any long distances, I find drop legs to be a detriment. The straps will likely rub you raw. Also, it tends to make me feel slightly unbalanced, if that makes any sense. Also they will frustrate you beyond belief in dense areas, as everything seems to snag on them.
If you're not going to be moving much, then I like them a lot. It's nice to move things off of your waist if you're getting in and out of vehicles a lot and that sort of thing.
Consider a dangler type sheath that rides on your hip but drops below where your pack waist strap would be. I tend to prefer this style and am looking for someone to do a kydex drop sheath for me.
Hope this helps.