Malaysian trumpet snails are a good addition to ecosystems. They're good at eating leftover foods and detritus. They turn over the substrate efficiently. They're also cute cones for crayfish to play with until they get bored, allowing the snail to go on with its life again.
It is generally perceived that MTS are too hard/thick for puffers. These MTS are not given a calcium rich diet, making them slightly weaker than their better supplemented counter-parts.