It feels good! But what feels especially great is feeling the hard stainless steel rod in the middle of your erect cock as you're stroking towards your cumshot! It's an indescribably wonderful sensation!
I tried one once, but it was not well made and had a rough surface. Couldn’t take a chance on going too far, because I thought it might cause a tear. It wouldn’t stay in, because it wasn’t far enough in. Thanks so much for your detailed answer and videos.
I've worked my way up to plugs that just barely pop past the membrane inside the head, with plenty of lubricant. Started with 6mm diameter as a trial, quickly went to 8 and 9 mm, then 9.5-9.7 mm and now finally to 10mm. Don't want to stretch any more as I have a nice collection of plugs that I really like that measure 9.7-10mm. My first 9.5mm is a little loose at this point. Obviously, this dimension is very personal! You'll have to experiment and discover what fits and stays in your cock. Another option, with the plugs with balls or bulbs, is to use a rubber or acrylic stretchy glans ring to hold the plug in place, if that doesn't bother you (does reduce the surface area you can stroke!). I love using plugs - just be safe by using smooth, stainless steel plugs that you can sterilize in boiling water before every use. Have fun!!!