winston boron IIX and sage slt

so after fishing a tfo 6 wt. and a sage ds2 3 weight for quite a while,
i finally wanted to step up to a great 5 wt. i've fished a friend's slt
and loved it (subtle but backbone, yada yada). so i called the flyshop
and they said to try the winston boron IIX vs. the sage. i'm going into
the flyshop sometime this week and hope to do that, but isn't the boron
IIX supposed to be a fast action rod? is winston just giving this
salesman a bigger commission or something? anyone ever looked at a
boron vs. the slt?

thanks,
hjs