My point with "constantly changing" modules is that some authors are like kids with ADD...there really isn't a rhyme or a reason to what they're doing at any given time. So, you get v0.02 of a module, find that it does the job "well enough", only to find that when v0.03 comes around, the whole architecture has changed. If the interface is consistent and the behavior is somewhat consistent (modulo new features or bug fixes), then okay. Having to write a wrapper is, in my opinion, a signal that either you got the module at a time when the module was marked alpha, or the maintainer is one of those maintainers who just changes the interface on a whim. The latter are the ones that I take issue with.