I bought and used a lot of varying types of heavy bags and I think this is a very underrated heavy bag. This bag has a unique design in the way that it allows you to adjust the weight, you can fill the amount of water you want and then fill the gaps with air, so you have no sagging points. I like to fill the bag to 120lbs and only needs a little air to fill the gaps and it still has a nice amount of give to absorb heavy shots (I am a heavy weight with good punching power). I like this water bag over other water bags because the shape is still like that of a traditional heavy bag, it has no curvature (like the aquabag) and it allows you to throw good hooks that land flat. I also like its short and compact 3ft design, with that being said, I like to hang this bag where the bottom is just a tad bit higher than my torsos because this allows me to practice uppercuts to the body as well. The material is nice too, compared to Everlast aquabag, it has more give and just feels overall nicer. I've seen complaints about its durability, but I don't see how you can hurt this bag unless you leave it outside for extended periods of time or in a damp and dinghy basement. The only concern for me would be perhaps the stitching eventually getting weak and breaking. Overall, this bag is great. It has a good weight to practice power punching with just the right amount of give and I think it being 3ft gives it a lot of versatility to practice a lot of punches if you hang it a bit high. If this company would make a 140-150lbs 3½-4 ft bag, with tighter stitching, I think they would have a chance of making the best heavy bag on the market.