Haven't used them so I can't comment on how they ride, but I can tell you that of the Fox, Bilstein 5100, OME Nitro Sports, and Rancho RS5000X shocks, the Ranchos ride the best of the bunch, hands down.
You have to be careful of those stores, because usually they just want to sell you whatever they have in stock, or whatever they'll make the most money (commission) on selling.