Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Jar very poorly-made

There seem to be two Oster-compatible stainless steel blender jars out there. The first is just the jar and lid, which is this one. It is basically junk.There are no actual true screw threads on the bottom of the jar -- just a molded thread-like ridge which fails to tightly seal against the bottom cap. In fact, even if you do manage to get it screwed on well, the jar randomly pops out of the cap during blending -- disaster.Even the included rubber top lid doesn't fit the jar well -- you might as well just put a dinner plate on top of the jar. I'm going to return this trash and try the other, slightly more expensive Oster-compatible steel jar, the one that includes the bottom cap. The image makes it look as if there are actual threads on the bottom of that one. My suspicion is that this is a dime-store knockoff, and that the $24 one is actually made by Oster (or at least, someone reputable).