The main advantage I see from adjustable kettlebells is "price", in a sense of the word. I have four kettlestacks (www.kettlestacks.com) and they function as a complete set of kettlebells from 10lbs up to >100lbs. Some people will say there is an advantage to progression, and that the large jumps in traditional sizes are a disadvantage, but I don't see that as an issue, for the most part. Varying the resistance by varying the sets reps works just fine.
Price flexibility is the big deal to me. Depending on how I want to work that day, I can adjust the kettlestacks to what I want to do (it's easy, doesn't take much time at all). For example, any given workout I can use (2) 1-pood, and (1) 1.5-pood and (1) 2-pood, or any other combination of the above, or go higher or lower than the above in any combination. Buying the four stacks and all the standard plates set me back around $300, but I have a complete set of kettle bells, 1, 1.5, 2 and >2 KB's. I agree with an earlier post about not throwing adj KB's. That's a disadvantage if and only if you plan to do throwing movements. Also, I can use my std plates that I bought for my kb's for my std dumbells. More on kettlebells !!
You should know that others appreciate the product (Kettlestack adjustable kettlebells) for reasons other than saving on shipping costs. Hope this can serve as some positive feedback for what you have done. More on kettlebells !!
I was curious but skeptical about bying the Kettlestack. After a month, it works fine, feels nice and solid and I get to choose the weight. Thanks for your product, I'm sure others will come around and appreciate it. More on kettlebells !!
Excellent! I am very happy with the kettlestacks. The handles are extremely comfortable as I hoped they would be. I am waiting for the weekend to really spend some trying different configurations (round contour vs. flat) and weights, but I couldn't resist trying them out after my Monday and Tuesday workouts. So far I have only tried lightweight snatches, swings and cleans. I found that setting the axle position to the highest level works the best for me in catching the snatch. Keeping a straight arm and catching it in the almost-upright-position (I dip into a half squat for dumbell snatches) seems to really help, too. More on kettlebells !!
I have just started working with the kettlestacks and am very impressed! Also, Thanks for the single heavy swing tip. Like you said, I find the one heavy kettlebell swing easier to learn than two lighter kettlebells. With your superior product and excellent customer service, I will not hesitate recommending kettlestacks to anyone in the islands! (KM Hawaii)