The head on this thing is the challenge. Once it's in, the shaft is just the right size. Definitely feel full while it's in. Ride if for a little while to get loosened up... Of course you'll need something, or several things, to loosen you up for this tool. Suction cup is great and holds surfaces well - until you get lube on the bottom and then you're cleaning it up to get it to stick. Same for any other suction cup. Firm shaft makes it easy to work and put pressure against as you're lowering yourself on to it. I'm kinda excited just thinking about using this again
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