BP just did a blurb on Riley:
http://www.baseballprospectus.com/ar...rticleid=31879
"His bat speed is average plus, and has a decent ability to put barrel on the ball, but his mechanics and pitch recognition needs fine tuning (bat wraps, leakage and over shifting his weight forward resulting in chases as well as in-zone swings and misses). With a plus glove and more than enough arm, he projects to stay at third giving you an average bat with well above average power."
So we've now seen reports on his bat speed that range from below average, to "fine" from FG, to above average from BP. Someone is obviously wrong, it's just a matter of figuring out who that is.
It would be nice to track this stuff over time so we can figure out who knows what they are talking about, and who we can ignore.