Even with the fairly large problem this blender has, I still recommend it simply for the cost and convenience. First off, the problem is the plastic toothed gear on the blender that meshes with the rubber gear on the blender cap will strip out fairly quickly. This has been mentioned a bunch of times by others as well. After about 6 months, I saw the plastic side wearing down and as those teeth get shorter, it causes the rubber teeth on the blender cap to also wear down (burnt rubber smell anyone), basically making it useless. The entire time I was using it, I would careful to make sure the bottle was seated, arrows lined up and I was pushing straight down, but it didn't seem to matter. All of that being said, this blender was $25, which is a quarter as much as some of the more expensive ones (that also seem to have problems from time to time according to reviews). Now what this blender does right. The blender, extra bottles and caps are all cheap to buy. You can also buy them at many different locations because this is one of the most common smoothie blenders around. The bottles are solid, don't leak and hold 20oz. The blender is as easy to use as could be, just put the blender cap on, push down and it starts. It also has no problem crushing ice or blending leafy greens. So even after my last one stopped be usable, I went out and bought another one. Sense I already had 4 extra bottles, it was still cheaper then buying a more expensive brand.