Burkhead is a great, tough, hard-working, talented running back. Last year with Nebraska he ran for 675 yards off of 98 carries and scored five touchdowns. He also had 11 receptions, good for 92 yards and two touchdowns.
His stats may not blow you away, but watching him play is a treat. He is a very physical running back who could help the Bengals greatly in short-yardage situations.
The guy that used to be the go-to man in short-yardage situations was Brian Leonard. Leonard is no longer with the Bengals, so Rex in-a-way is a Brian Leonard replacement. Perhaps even an upgrade from Leonard.