Before you go off yelling about Buffalo's depth at running back - yes, the team still employs both Fred Jackson and Marshawn Lynch - keep in mind that teams routinely visit with a wide variety of draft prospects, regardless of need, just to get a sense of the prospects as people.
That's not to say that Spiller wouldn't have value for Buffalo in the event the team's interest is more serious than we're anticipating it will be. Spiller is one of the most naturally gifted athletes available in this year's draft class, and he's also one of the most productive prospects available, too. Spiller (5'10", 196 pounds, 4.37-second 40-yard dash) is easily one of the premier playmakers available, as he finished his Clemson career averaging 6.8 yards per touch (combined rushing and receiving) with 43 total touchdowns.
This is the second confirmed visit that the Bills have scheduled with a draft prospect, as NFL.com's Gil Brandt reported over the weekend that the team would host Florida QB Tim Tebow for a workout.