not so much as impulse buy, but i will spend 8hrs driving to far away shops to see what they have, then feel it would be rude not to buy something, but like Terry says, i think i know enough to get by with any or most plecs, then do specific research when i get back, i guess my last proper impulse buy was my chubby plec, saw them and had to get one, always thought they were great looking plecs but didn't know any specifics about them before i bought him, luckily though i have 1 tank with wood eaters/ vegetarians in, 1 omnivore and 1 carnivore tank running so am fairly safe as far as the dietry needs of any new plecs