Firstly, the name isn't literal. These will not make you orgasm, using them to firm your pelvic floor makes it easier to orgasm during sex. That being said they do get you "ready" in a short period of time ;)
I bought a lighter, connected set of Ben Wah balls a couple weeks before I got these. I didn't feel they were heavy enough, even if you relaxed around them they'd stay in and the way the were designed made cleaning a hassle. So I looked and compared and found these. These were the heaviest I found here, at the time I ordered. I do kegels regularly without weights, and just one ball makes me concentrate on not dropping it.
On a side note, you cannot use these while using the bathroom. So make sure you go before or can release them before you have to REALLY go or you'll be fishing them out of the toilet :)