Amazon and seller provide this at an excellent price with the usual speedy, time, and money saving service! I have never had an stationary bike before to compare. they are not black black. Works perfectly for my regular bike and better than any other stand Ive tried for the ridiculously heavy cruiser, though the bars are fanning out a little on that one. Another reviewer said they sit too low on the nose which I was worried about but I found this to be more an effect of the frames coming down so far on the face that it feels like the glasses are sitting low rather than then not staying in the right spot. Ive worn them for a couple of hours straight without a strong need to take them out to give my ears a "break". It has a little photo receptor that attaches to the front left arm and, upon programming your C1 button on your controller through the DJI app to activate/deactivate the front LED Headlights, you simply push the newly programmed C1 button to light up the front, sending a signal to the receptor which turns the holder shaft in and out. Tried using them wired with an amp and even still they just didnt feel up to snuff. If you?re not used to birks there may be an adjustment period. Purchased in 2014 and still great.