Yes, it writes and it does so just fine. My problem with this is that it sort of looks like a 51 but if you are familiar with the original, you may find this one a tad disappointing. The first thing I noticed was that the weight was different in my hand. Modern materials and manufacturing, and a cartridge instead of refill mechanism may contribute to this. The cap no longer has the trusty clutch ring allowing you to slip on the cap but it threads on which I see being a problem down the road as the threads on the body are plastic. The big gotcha for me was the distinctive hood over the nib. On original 51s, the hood hugs the nib and it looks like it was meant to fit. On the new version the hood gaps from the nib which just looks cheap. If you want a pen that writes get one, I would recommend the Parker IM over this one though, it just feels better in your hand.
One month later… don’t bother with this pen. It is not a best effort by Parker. My cheap Noodler is more reliable. It takes several minutes to start writing again after sitting a couple days and then it skips badly. Nice try Parker but you could have done better.