I think there are mainly "negative things". The early stage is the most profitable, if we talk about blinds per hand. The problem is you use the late registration, you are with short stack and you pay the same fee.
Can be good for some tournaments. With huge add on. There was a "window" in PS, for some tournaments. You can go late, do a little "tanking" and use 10x add on. This was profitable. But you can't do that anymore.
I think, if you want to use that, the add on must be big, at least 2.5x. Or some freeroll...