Sounds like a Darren Sproles type. And that's not shabby at all, but I don't think a Sproles type can be a 3 down back type who can carry the load.
Hmm Clemson has him listed as 5-10 185 lbs.
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That's significantly different from 5'8.5! What is his real size height? If he shows up at the combine 5-10 200 and runs like a 4.2 40, you'd have to rethink things.
Overall I think Spiller's versatility as a receiver gives him the edge though. 1,000 yards rushing, 500 yards receiving, AND good blitz pickup? where do I sign up? He'd give Brady another weapon in the receiving game as well as jumpstart the running game. In fact if Spiller turns into a Harvin quality receiver, you don't even need to draft/sign a #3 WR do you?