I have the MKS FD-6 on my Swift. They're sturdy, fold and unfold easily, and the bearings can be serviced, albeit with a bit of futzing. Their only downsides are they're a little on the heavy side, and they don't have a good grip, the provided serrations just don' have much "bite". I use them with toe clips, had to modify the clips a bit though.
The fully detachable MKS pedals have a loyal following. Wellgo also makes some detachables that look nice (I'd like to see some feedback on them).