My question is- is the Falcon a viable everyday carry pen? I also think the nib just looks so intriguing!
My Pilot Falcon is my favorite EDC pen by far - just as good at jotting down notes as it is for expressive writing! Even now after discovering Vintage Flex pens, it's still one of my top 3 pens that I write with on an almost daily basis.
I own the SF Falcon, and personally I'd highly recommend it. Given the fine line width, it's extremely smooth - I think you'll find it smoother than a Metropolitan Fine -- at least mine is. For cheap paper, look at Noodler's X-Feather ink, although I admit I love using Pilot Iroshizuku kon-peki in mine.
Keep in mind the nib has to "break in" a little before you get much line variation. You don't want to push the pen too far too fast - so stay gentle with it. If you do the "figure 8's" like you see everywhere, be really careful on the downstroke, since it's very tempting to put too much pressure on it ... you will risk a spung nib. As you write with some pressure for line variation, go very gently until you discover the nib limits. The nib will loosen up over time and you'll feel it flex better. In fact, maybe I'll post some samples of when I first got it compared to now (it's only been about 6 months now I think).
One trick you can use if you want the most line variation is to prime the nib. Assuming you are using a CON-50, just turn it clockwise slowly until you see a little ink bubbling from the hole near the section (with the nib pointed straight up!), and then twist it back the other direction just a little so you don't get a blob of ink when you first write. This should get you a few lines of having far less railroading. If you do experiment with this however, do it after you learn the limits of the nib first. Practice this on some scrap paper first though, not on finished work!
At any rate, I love this pen. You might also want to consider a Pilot Custom Heritage 912 with a SF nib. You can't get them in the US normally, however especially if you are an Amazon Prime customer, that's a good place to look. Japanese sellers (including Amazon, interestingly enough) either ship direct from Japan, or, sometimes you can find them with Prime shipping as well, meaning they actually have them shipped over to the US already. My SM nib seems about as flexible as my Falcon SF nib, accounting for the base difference in tip size. It also uses the larger CON-70 adapter, which holds quite a bit of ink. These are running about $150'ish on Amazon at the moment. One important thing to keep in mind though is that you have no warranty on the pens coming over from Japan this way.
Honestly though, I think you are going the better route. The Custom 912 soft nibs (SF/SFM/SM) don't seem as resilient to me as the Falcon, although I definitely don't regret my recent purchase. I just wanted to mention it as an option since the Custom 912 is a very cool pen with tons of nib options.
Last route I'll mention though, that I'm sure others will, as that you can get a fairly nice Vintage flex pen for the same amount you'll pay for the Falcon. However, some people like new stuff better - and honestly what you get might be terrific, or might be a half-baked repair. You have to be willing to do some work on it yourself to get it working properly - one reason I tend towards the new pen option myself sometimes. I have several vintage flex pens myself now, yet I needed to work on all of them prior to use. Again, even though a Vintage flex is a whole different beast, there's something to be said about having a brand new fountain pen that's also under warranty!
Good luck, and post back with what you wind up with!