Kenko is becoming popular. I don't have their extender but their extension ring with electronic coupling for macro is really a gem.
I would think it is not a bad option probably similar to Tamron's glass but would be better to get accurate info from someone who actually owns one.
BTW I did a few purchase directly from Hong Kong and China, through sellers on ebay with good feedback and were happy at the end of every transaction with accepting slight longer shipping, usually in 2-3 weeks range.
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