I have the TS200 on both my SKSs. For the most part I like them, but I don't like how the rear aprature can be turned this way and that way. What I mean is that if you take the aperature between your two fingers you can easily give it a quarter turn either clockwise or counterclockwise. Who's to say that if the aperature twists it will return to the exact starting position. I really don't think that, that aspect of the sight was well thought out by the designer. Another thing, I have the target front post, and it's loosely threaded in. If one were to tap it with say a twig it would probably throw the front sight off. I guess the fix it to locktite it in when it's in the right spot, but I don't really like that option.