Gifted a Heil HM-PRO and a Heil GM4, Keep or Sell?

A friend just handed me two mics that his company had bought, but never really used. They didn't need them anymore as they were for a project and he couldn't even remember why they bought them to begin with. He knew what I did and said I could either integrate them or sell them, he didn't care.

So here I have two mics. One, a Heil HM-PRO and a Heil Goldline GM-4.

Has anyone had any experience with them? The HM-Pro is a tiny mic that sells for roughly $80-$100 and the Heil Goldline GM-4 is an interesting looking gold mic that sells for around $150.

What are your thoughts?

My co-host desperately needs a microphone...those built in webcams aren't so good. :D

In seriousness, that's some good fortune. It's not often you are gifted something useful/worth something. I have never used either but I would suggest playing with each, choosing your favorite, and offloading the mics you don't need/like as much.