The body of the pen is metal (and bright orange), but the insides are all plastic. When the pen is extended, you can see part of the plastic in the middle of the pen which provides the extra length to improve the grip feel when writing. I would love to see this bit of plastic replaced by metal of the same color as the rest of the body. I'm not sure why they chose to use plastic here. It breaks up the aesthetic, feels cheap compared to the rest of the pen, and takes the overall experience down a couple of notches. Another complaint about the design and quality is that the spring inside of the pen is a bit noisy. The click mechanism sounds normal and has a healthy "clunk" when opening and closing the pen, but the spring can make some annoying noises at times that make the pen feel cheaper. Again, not a deal-breaker, but seems like something Lamy could fix really easily with some higher-quality springs.
Now, the refill in this pen is also surprising. When I hear "ballpoint," I automatically recoil in disgust because of the many, many bad experiences I've had with regular (non-hybrid) ballpoints. I'm not sure if the Lamy ballpoint refill is a hybrid ink formula, but it's fantastic. Compared to others like the Schmidt EasyFlow 9000 and the Uni Jetstreams, it's not as dark and bold, but it's every bit as smooth and reliable. I'm actually really impressed with the refill.