Due to injury, Lloyd's 2007 was basically a wash. Now if you compare his first 4 years and Berrian's, they are pretty damn close:
BB - 150 receptions, 2197 yards, 13 TDs, 14.6 AVG
BL - 128 receptions, 1875 yards, 13 TDs, 14.6 AVG
Also, like ostrogoth mentioned. Lloyd played for Turner at Illinois where Lloyd had back to back 1,000 yard receiving seasons in 2001 and 2002.
So it seems like a pretty safe signing with some upside.