GreenSteel,
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The vacuum based extenders have many advantages and some disadvantages. It seems that everyone is making vacuum based products these days. The old noose system used to sit on the penis in a very delicate area and could not be worn safely for long. Vacuum based extenders, however, are sold with the featured benefit of being able to wear for longer periods without interrupting blood flow. There is some truth to this but the higher the tension the more a vacuum based product will interfere with blood flow. Also, regular checks - at the very least - should be made when wearing an extender and the safest route would be to wear in 20 minute sessions. Vaccums can also cause blisters. The auto-extender is sold with tape and some systems are sold with a glans cover in an attempt to solve this issue. Certainly even if blistering does not occur, fluid buildup may and you need to watch for this. Overall though the vaccum based system seems to be safer than noose based alternatives.
Have you gained on the newbie routine? Are the gains slowing? You say you feel the need for more intensity but you don’t ask for ways of increasing the intensity of your current routine. This might be a better and easier route and will not cost you money.