I have never sat in that, but I did sit in 17D and looked at the people sitting in 16AB. The bulkhead doesn't have a cutout, so while you will have lots of room in front of you for your body and knees, you cannot extend your feet past the bulkhead. I saw the two guys sitting there putting their feet on the bulkhead a lot, and doesn't look too comfortable.
So, if you usually sit pretty upright, that's great. But if you're planning to recline the whole way and extend your feet far forward, they're not good seats.