I have never tried kegel or ben wa balls before, but I've always been curious to try them so when the opportunity arised and I went for and I must say these are definitely useful. I love the presentation and packaging -- it's very cute, sleek and almost elegant. The 4 balls are awesome. The gold ones are 30g and the blue ones are 40g. You get two holders a single and a double. I started off as the direction stated with one gold ball then switched to a blue ball. After that you'd do two of the gold, then a gold and blue and finally working your way to the two blue. This is easy to clean before and after use. Insertion is easier when laying down. I enjoy using these to strength my pelvic floor muscles. It does feel weird because the free weights roam around, but it works for it's purpose of squeezing my muscles. I've only used them for about 15-30mins a day, may try 45 mins, but I'd never go beyond that. Think these would be perfect to include in a leg and butt workout especially when doing squats.
Sidenote: I adore the pouch it comes with and the warranty card is always a plus!