So I've been using this pen for a couple of days now and I'm quite pleased with it. The F nib is almost as fine as the EF nib on my Pilot Penmanship, but it's much more paper tolerant than the Penmanship is. I haven't tried the M nib yet (will run this one out of ink and then switch).
So far the pen has not had starting issues, drying out issues, skipping issues, although it gets just a little drier if I do a lot of fast writing. It's not as wet as my Safari is, but that might be the ink's fault.
It writes well on cheap paper although I've had to floss the nib twice now to remove paper fibers. I've never had to do that with my other pens, but I'm not really sure what to make of it. The cross ink seems more prone to feathering than the Noodler's Blue that I'm using in my other pens, but I'm not really worried about that since I plan to use N.B. in it once I run the cartridge dry.
I found 2 Cross converters on Amazon, one threaded, one not. If I decide to continue using this pen, I'll pick one up. In the meantime, I can just refill the cartridge.