The glide foot is the one I leave on the machine and only take it off when I need to use something else (like the ruler foot). The ones HQ sells are plastic and I'm on my third one - they get stress cracks where the screw goes and over time won't they get a bit sloppy. Wish they were more durable, I don't like having a foot that is a wearable item.
Since it's my favorite foot, I keep an extra one in stock and buy another when I start using that one.