To IUI or not to IUI

Hi ladies! This will my our last cycle before having to go to IUI. Just wondering your experiences and recommendation? We’ve tried clomid and times intercourse but unsuccessful.. we’ve been trying for a little over 15 cycles.. during that time I had one pregnancy that resulted in an early miscarriage early this year in January.. All my tests have came back fine, blood work showed boarder line PCOS, so I am on metformin once a day. Hubby has super sperm, not kidding he had like 167 million with a 52% mobility.. I’ve heard IUI is used for male infertility, which is not the case with us.. IUI will be $1,800 per round so we want to make sure this is the next thing for us..

Suggestions? Ideas? Successful IUI stories? What was the reason you had went down the IUI road?