for masterminds they are borderline required to slot in pet global/aura buffs
for everyone else, there are many uses. Sometimes its for enhancement slot space saving, other times there isnt much else.
Radiation Infection, Beta Decay, Darkest Night, etc: 3 Enzymes
An immobilize ability you probably wont ever use, or use rarely: Endoplasm. Web Grenades, ring of fire, etc.
Forge, Fort, Farsight, etc: 3 Membranes
And to me since all Resist set bonuses suck for Perma-hasten characters, 3 ribos and use slots elsewhere or sit in some procs
And for my super reflex characters [Tough] is my only form of resist to slot procs in, 3 ribos, 2-3 procs
actually the prices for hamis are insane enough as it is just ignore this post