The whole Purist range of rods were based on a specialist concept. However, that doesn't mean that they were all heavy rods. The fella attached to the concept, Darran Goulder) is an allround specimen angler. The smaller species such as roach and perch were catered to with some of the rods. The Purist Feeder (PURF12) wasn't its full name, it's actually the Purist River Feeder. It was essentially the leger counterpart to the float anglers Purist Trotter (PUTR15).
The catalogue blurb mentions "is a pleasure to use when feeder fishing or link legering on small to medium sized rivers. Ideal for shy feeding roach and dace in the winter, or sorting out the larger specimens when using maggot feeder for big chub and barbel in summer, this rod will cope with most situations and has a superb through action. The assortment of tips ensures you'll have the perfect indication no matter what the conditions."
I barely remember the rest of the range, though I have a pair of the Purist Brench rods. I do recall giving the Purist Trotter a good coat of looking at. Its similarities to the 15' Catana Match Rod of the same era was rather striking. If it wasn't the same rod in a different livery, I'd be amazed. There's a reasonable chance that some of the other Purist rods, including the River Feeder, were also other Shimano rods in a different frock.