I have kept pipefish in my tanks for over 10 years now. They are much easier to keep then a seahorse. I have 2 breeding pairs in my tank right now. If you do good research and are patient, you should be fine with them, as mentioned they require special feeding and good water quality.
Sorry but it all goes with the everyone's tanks and success is different with different animals, such as Mike has great success with linkia starfish, most of us have bad experiences with them.