Multi-function modules are nice to have in the beginning because they allow you to get a "taste" of everything and alternative set-ups.
For me... I really love having the micro versions of Temps Utile and Ornaments & Crime. The Disting Mk4 isn't a module you want to try and adjust in real-time. But if you're patient, it's a great Swiss Army Knife module that will let you explore different functionality that you might want to bring into your rack as dedicated modules.
I have the BIA and Manis Iteritas. They are okay... but not the be-all end-all modules. You will find it impossible to get back to "that awesome sound" you had a moment ago unless you're very attentive to EXACTLY where the knobs were. The sweet spot between sonic goo and sonic glory is often a fraction of a millimeter. It's also hard to get them to a particular pitch with a tuner due to all of the crazy harmonics. You won't be layering them with much.