For 150 euros, you have a manual lens, sharp especially in the center. The build quality is better than expected, and it gives a retro look to the camera. It is very fast in low-light conditions.
As a first manual lens, I expected it to be more difficult, but with a little practice, it produces very good results. The size is approximately the same as the kit lens 16-50.

Awesome price and a very good lens for an amateur photographer like myself. The wide aperture offers exceptional bokeh photos and the manual focus forces you to move and try, but at the same time it's very fun. Suddenly my shots have taken on a whole new dimension, really. Until now, I couldn't afford a lens with such an aperture because of the cost. The only downside is its cap, which doesn't fit well at all and you definitely need to get another one (very cheap from the screw).