I own one of the Parker 100s so I thought I would weigh in on your question. Obviously Greg can provide his own impressions but my experience with the 100's cap is it is not cheap or flimsy. It does appear less substantial than the body but that is really more of a design than a quality thing. The pen is so bold, glossy, and aerodynamic that the cap suffers by comparison. The cap is metal but it is not heavy. It has held up well to my use and abuse.
A quibble with the cap that others have expressed, and with which I would concur, is the cap has a bit of a "wiggle" when snapped onto the pen. This is more of an aesthetic issue as the cap does its job by staying firmly in place, protecting the nib, and keeping the nib from drying. Bottom line, if they were to design the pen again they might have slimmed the barrel grip section a bit, which would have given the designers an opportunity to integrate the cap a little more into the overall pen's design.
Hope this helps.
Thanks for the review! I've been looking at these pens for the past few days, and thinking about buying one, but I haven't seen any live so your review is a great help.
Can you say a few words about the cap? Whenever I see this pen in pictures, the cap looks less substantial than the body. I'm assuming this is because the cap is matte whereas the body is high gloss black. Unfortunately, the effect in photos is that the cap looks cheap or flimsy to me...
You mentioned that it's titanium coated. Does it feel like metal, or plastic? Is it heavy as well?