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I have one from china lands that works well but even at 900g or 700g I still would only bring it on very special occasions because it's not as comfortable to sit in it for long anyway. You kind of have to support yourself with your legs a bit all the time, it's not relaxing for long also assembly/disassembly gets old on the go and when it's cold you need a sit pad to insulate your ass.
A simple sit pad however always comes with me, it's almost as important as my rain poncho at this point.