Career (1200 AB) line of .280/.354/.442/.796 versus RH pitching. Solid, that.
Gomes' career line against LHP: .276/.371/.507/.878 More than solid, that.
A strict platoon would be around a 280/360/475 835 line with decent speed and poor defense. (Though not as bad as last season.)
If both continue to hit their career averages, Red fans can expect something along the line of Dmitri Young.
Not a bad deal at all.