I haven't owned a system pipe, but from posts it seems like they are useful to smokers who struggle with moisture. I don't, so this wouldn't help me, but some find them preferable. I own one P-Lip, a nice Peterson Rhodesian. I enjoy smoking it, but I wouldn't buy another P-Lip. I feel the fishtail (usual pipe bit) focuses the smoke better and delivers better flavor, and I don't find the P-Lip has much bearing on tongue bite. Also, with the P-Lip, I feel I have to stick the stem further into my mouth, which is fine but a little distracting. With a fishtail bit, I just don't think about it, and feel I have more control. It's individual; some want mostly P-Lips. I think fishtails are universally preferred since P-Lips are sometimes offered at a slightly lower price, which means (I surmise) they don't sell as fast.