I have kept a few pipes.
I feel that getting a healthy pipe from the start is the most important thing that you can do. I had success with a bluestripe and two bandeds. I also had failure with a banded and a dragon face. I was very upset about the dragon face because it appeared to be so healthy when I purchased it. In the end, I am not certain what caused my failure w/ the df. I think the unsuccessful banded, although it ate in my care, sucumbed because it had been starved at either the wholesellers or the retailers -- that it was "the swimming dead," if you will, before I ever got it.
My banded pair and my bluestripe, both were relatively easy to get onto frozen food (much easier than, say, a wild caught seahorse.) I used frozen freshwater copepods as my transitioning food, as cyclopeeze did not seem to work. Usually, the movement of the frozen pods in the water column was all that was necessary to get them to feed; I think I bought a bottle of pods for each to help with the transition.
I really loved my bluestripe. She was a great fish (females have snout bumps, but they are usually smaller and clear -- maybe they grow with age?) She was in a small tank (24 gallons) with a lot of rock and macro, but as much as I sat in front of that tank, I never went more than a minute without seeing her buzzing in and out of the rocks, looking for little morsels to snick. Bluestripes are a fish that I would pick up every time I saw a healthy one (which is regretably few and far between.) I know of a LFS that had one for some time, and then finally got a female and for a while the pair spawned liked clock work, despite the tank set up being less than ideal.
My bandeds were also great fish, and very visible. I had them for 6 or 9 months, until something brought an illness into the tank. At the same time, the coral beauty decided to go after them. I caught them and put them into an issolation tank and tried to discern what was wrong with them, but they both succumbed within a month. The whole family was sad about it. Since then, I haven't found any that I think are healthy to try again, but I would. I have learned some things since that time and believe that I could be a better owner to them.
Anyone keep alligator pipes? Gulf pipes? Pugnose pipes?