Really really nice. As someone who makes a lot of hip-hop style myself, I virtually cannot find anything to fault on this piece of work. I especially like the beatbox samples that you use, it just polishes off a really chill song as it is. I do agree with Virginia-Slimm in that it would do really well with a vocal sample, and maybe lower the subs on that bass you introduce at about 0:50 just to bring it out a little more in the mix.
The reversed wahs, delays and resonance are awesome. I like this track a lot. Very chilled out. The synths are well chosen and implemented skillfully. a vocal sample would really shine on this I think. Nice work here.