Firstly, welcome to FPN! Great question for your first post.
For me, the Konrad was really good to start with. Yes, it needs a lot of pressure (too much for my hand muscles to last more than a paragraph), so it's fun for initial experimentation to find out if one likes the overall flex style of writing in a basic form. It's also great for the occasional card or thank you note.
The Konrad helps one to learn about pressure being required on down strokes and a light hand on the upstrokes and to start finding that rhythm. I couldn't ever imagine springing this tough nib. So, it's tough.
It also helped me learn how to fiddle with pens, nibs, feeds, ink flow, and gain confidence in doing so. I also learned how a piston filler worked. I discovered I like piston systems. My pen was rarely frustrating to re-set up for ink flow. I had a couple of those occasions, but I found its sweet spot far more often than not. I didn't need to alter ink channels, fins, or heat set the feed differently.
Then began my hunt for vintage. There's vintage, and there's vintage. The Konrad experience along with info on FPN helped me narrow down that hunt considerably. What I call 'better vintage' has specifications which differ from other appreciators' specifications of 'better' vintage flex. I now have two vintage fps, plus a couple of vintage dip nibs. Each is quite different with their own pros and cons. Naturally, they are all far, far, easier to flex.
I like my Konrad as a pen so much I recently ordered another with a flex mod because I didn't have the tools, nor did I have cheap and easy access to spare nibs if I messed up a few. The cost of ordering the mod was far cheaper than buying a dremel. None of my friends had a dremel I could borrow. I really didn't feel confident about doing it by hand. I also wanted my existing Konrad to stay as-is, hence the second purchase.
The modded nib+pen is on its way as we speak. I don't expect it to respond like my snappy vintage nibs. I imagine it will be a little more painterly. I do expect I'll have a pen that is easy to clean/pull apart, that I can easily get parts for, far easier flex, and, from the images I received, will have greater line variation than I can afford to pay for in vintage fountain pens. (I'm not into the repeated hassle factor (to me) of regularly corroding steel dip nibs.)
OP, if the Konrad or Ahab or Creeper are in your price range, I reckon they're worth a go. You may even have tools to hand and the confidence to tailor it for yourself.
Edited by Intellidepth, 07 April 2015 - 00:08.
Noodler's Konrad Acrylics (normal+Da Luz custom flex) ~ Lamy AL-Stars/Vista F/M/1.1 ~ Handmade Barry Roberts Dayacom M ~ Waterman 32 1/2, F semi-flex nib ~ Conklin crescent, EF super-flex ~ Aikin Lambert dip pen EEF super-flex ~ Aikin Lambert dip pen semi-flex M ~ Jinhao X450s ~ Pilot Custom Heritage 912 Posting Nib ~ Sailor 1911 Profit 21k Rhodium F. Favourite inks: Iroshizuku blends, Noodler's CMYK blends.