That's one seriously quality track for an hours work.

Really nice shuffly feel to it.
Lots of nice little breaks to keep you interested while it builds.
Great use of the sample, effectively kicking back into the tune.
Good stuff all round.
It builds down and ends well too.

Currently there's not a great deal of progression between the breakdown and when you get to that fill at 4.44 though.
You've got layers dropping in and out, but no new major sounds coming in.

I think it could do with probably one more layer to progress it a bit further.
Maybe use something like the section at 4 mins 44 and then add in another layer using the same main hook, but a different sound.
Because it's quite a bassy hook, you could even add in two extra layers, one using mid range frequencies, and one high.
Pitch them around and cut them up a bit and I think this would spot on :)