I bought this for our piano. It stands quite firm behind the music stand and the brightness is very good.
The only complaint (which I suppose for lamp is a major one) I have is that if you are playing in complete dark and just have this lamp for illumination, you notice that there is a very slight flickering. I have checked the connections and they seem OK so I have put it down to cheap LEDs being used, which is a shame as it is not exactly a cheap lamp.
Since there are not many other lamps on the market at this price (many of the others being far more expensive from what I see), I will say that generally it is OK, not amazing, just OK.