I don't but my dad was issued one in WWII Europe. He said it did the job but manage to pick up a Thompson which he kept during his time there. Unfortunately he can't offer any info as he now resides in that great hall of heros in the sky.
My dad carried them in WWII and Korea along with the Garand. I have a couple and they see range time.
Fun fact: I have a friend who is a retired fighter pilot (F-102 / A-7) who flew with his father who was the Wing King. His dad carried business cards that said "Have Son will Travel"...he flew with the Tigers and had a Zeke kill in WWII.