After reading a few responses, this sounds like I read posts before. Yes, the bicycle style scuba air compressor. Youtube videos can't lie, this thing has to be incredible. We all say junk, but there are videos saying how good it is.
Now I am seeing posts about wanting to dive 500 feet, for no other reason than bragging rights.
I would love to be on the boat in 10 years when you start bragging that " I dove to 500' before" and there are some real tech divers, ex commercial divers, that look at you like an idiot. So you did a 500' bounce dive? There are people out there who have done 600' for good reasons. Cave exploration, oil rig work, ship salvage. And you are trying to impress them with a I am super diver attitude.
There is too much ego in you little grasshopper. I suggest you put this enthusasim into something like being a politician. They thrive on having a big ego.
I would avoid diving with you and you attitude at all costs.