I mainly use phosphor bronze/plain steel sets bought in bulk. About $2/set that way, and I think very little difference in sound, if any, from most common name-brand wound bronze or phosphor bronze sets of the same guage. The wound Elixer strings do last longer, but cost so much more and you're only getting half a set of coated strings, anyway. But if you have an inexpensive mando that tends toward a tinnier tone, the silk/bronze or silk/steel could help mellow it, and I agree these would be well worth a try.
"Listen louder, play softer"