I purchased a Cheng Shin inner tube (model # ZX011221P) back in february, and it's been fine so far. I probably won't buy one again, however.
When it shipped, it came in a deflated(!) state, without instructions on how to correct this. I filled half-way up, and passed out twice, before I realized that it would be much easier if I pulled the core from the valve stem first. Also, the vulcanized metal they use for the threads chafed my lips quite badly.
Overall, I give it a 4 1/2.
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