I just had to see if this gas cap was any good so I bought one.
It shipped from China on May 21 and I got it today, June 1 -- not bad considering it came half way around the earth by the slowest means commercially possible.
Biggest complaint is the smooth edge making it a little difficult to grasp and twist on or off. Also the chrome sheet metal cover is crimped on -- I wonder how long it will be before it falls off?
But the good news is it fits the old style large TW gas tanks. I show it on an XT350 tank. It is well vented so in the event of a "fall over" one most likely will have to upright the bike quickly or risk losing a lot fuel.
Overall impression so far it is worth the $5.70 and wait to get it.