First of all, it's a perfectly functional product that I use for my regular piano practice. On the somewhat negative side there is the following:
1. Contrary to what we are used to, it is not a K&M product made in Germany and made of steel. It originates from China.
2. It is not as solid as you'd expect from a "classic" K&M product. E.g. the base of the lamp is made of plastic (though it is still heavy enough not to move around the surface).
3. The light temperature of the lamp is too cold (deadly white) and not as brigt as I would like it to be.
4. As a potential drawback, the LEDs can't be replaced. When they go, the whole lamp is useless.
By way of a conclusion, with this price tag I would expect a better product. At the same time, I can't see an adequate alternative either. In any case, it does its job and the drawbacks that I mentioned are not getting on my nerves of a perfectionist.
So, if you don't see anything definitely better on the horizon, buy this one.
After about a year of moderate use I notice that the light of the lamp started to tremble and blink, which is really annoying if you are working on a new piece of music. I first thought it was the rather cheap-looking AC adapter, but even with an alternative one the trembling is still there. I'm now thinking about sending this one back to Thomann for a refund or a replacement. Pity. ;-( The rating of the product is now "poor" in my opinion.
Finally, I think that I've found the reason of blinking. It was the contact where the adapter is connected to the lamp. Probably the contact is a bit loose or maybe some parts of it were initially oxidised, so I had to connect and disconnect it a few times before the connection became good and the blinking disappeared. Thus, I raise my rating a little bit, as the problem does not seem to be too big.