I've only done 2 infusions so far, and I think the base idea is comparable to synthol use, but synthol is more permanent.. essentially the thrill is similar to using a vacuum pump, except the result are more extreme. The feeling of that much weight alone is really profound. Of course going into it you know it will only last a short period of time so you end up spending as much time paying attention to it as possible which is also really hot.. Added bonus if you're an exhibitionist is it's hard to conceal.. I'm sure each person has a different experience, but really for me it's the feeling of having a huge heavy sack.