Probably the most irritation I have had is from the burn of the skin stretching.
Hey MrTips welcome to the forums,
Be sure to point the stretcher up and pull some of the scrotum skin through the base ring. Point it down and pull some of the skin above the penis base through the ring as well. This should eliminate the skin stretch and the burns. Worked for me. Unless you want to stretch the skin of course :)
The Penimaster, with its wide strap, is more likely to actually grip the ends of the CC and do a better job of putting traction directly on those tissues.
Especially when a Theraband wrapping is used (gives a very good grip) and the rubber strap is fastened an inch or so below the ridge of the glans. That’s how I do it anyway. I’ve reconsidered and have been doing manual stretching lately, followed by at least one hour of stretching with the Penimaster. A very good exercise in my opinion. We’ll see in a while if I’m on the right track.