[zappan]

Yup, it mostly boils down to what you seek for. If you seek a complete freedom in your working hours, it might not be a fit for you, but if you seek a steady flow of work, being a member of client's team, with some regular communication involved - Toptal is an organized place to pick up some work without the bidding games happening in elance & odesk.

I'm also a member of the netwokr, picking some work there, some through my own direct contacts. Generally, 'rules of the game' are always agreed with the client, when such rules aren't a fit for both sides, no need to engage in such work, as you wouldn't in the case where you find your own clients. Some are more, some other are less flexible, just like in every other place.