For delta updates, yes. But not for anything else.
This is essentially a design bug in the client, and the reason is quite technical. Basically it boils down to that when you start with a fresh image, the state of the system is that no artifact is installed. However, the state should be that the artifact corresponding to the fresh image is installed. This causes the client to have no base to which to start from, and therefore it cannot install delta artifacts on the very first update.
We do have it on our backlog to fix this, but the fix is unfortunately quite complex.