Hopefully this will answer questions that some users have. I researched countless reviews to decide what manufacturer and product to choose. My specs were all met completely:
Solid suction to aid with erectile dysfunction.
To save time and not be a hassle, it must have reliable stimulation, and easy setup and cleaning. A tall order, so tenga was the perfect choice.
I added the 03 Shell Spinner while buying the Flip Zero, both top choices based on all the reading and videos I went through. Turns out that the Shell Spinner is at least as good as the very advanced Flip Zero! Further testing will tell for sure. The Spinner also has the edge of being easier to use and clean.
My current opinion is to try a Spinner first, or even two different ones. I'll try to edit, or submit an updated review if further use changes my opinions.
Other info/details:
Shell Spinner is great for an average sized penis. Probably good for smaller, or a little more than average too. Much longer or wider than average might make it frustrating. My higher than average sensitivity may add to the stimulation level, who knows. The sounds made weren't loud at all, but that must vary with force, speed, grip, and amount of lube. (Better to have too much than not enough.) Also be sure to squeeze as much air out as possible before insertion for more safety and less noise.
And! This Spinner worked great before my half of a blue pill even kicked in. Then I went again 45 min later. 5/5 will hit again, buy again, and have a much better life from now on. Perfect if your spouse or partner has a lower libido than you, too. :)