I have been using a VacExtender mod v3 for about two years. Once you learn how to properly seat your glans and vent the cap it is a very comfortable and effective. However, if you do not mount the cap properly, it can result in bruising. The v4.1 is said to be easier to mount, is more comfortable, and less likely to cause bruising.
I tried to use a VLC, but I could never get it to fit properly. I have a small glans in relation to my shaft and I could never get the cap to stay on under tension. I also have a large turkey neck. Could just be a personal issue - YMCV.
Never tried the v3 but I am totally loving my v4.1 I have never had any problem with it whatsoever. I've never even put a tape around my glands and I never got blisters. I extend 8-12 hours a day without any problems at all and comfort wise it is the most comfortable mod along with my x4 wide girth base having my balls through the base and have the extender point down I can literally last 8-10 hours without any discomfort at all if I want. However, a 8-10 hour session without breaks can possibly lead to edema which hasn't happened to me yet throughout my vac mod extending experience.
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