I bought a used 149 (relatively modern- 80's) to see what the fuss was all about and paid a third of the price. The nib had to be adjusted by a well known nibmeister before I could use it without getting frustrated (the previous owner must have had a heavy hand and sprung the nib slightly resulting in skipping). Now it writes perfectly (it fits my hand comfortably) and I think the styling is beautiful. Because of the conservative black body (accented by gold trims), the eye is drawn to the large nib which is exquisitely fashioned. If you like looking at beautiful objects or instruments such as I, this nib is mesmerising! However as this thread wants reasons NOT to get a 149 here are mine :-
1) The nib on my 149 is stiff and unyielding - not great if you are after a springy, soft nib
2) The nib does not disassemble without buying a special tool and even then you'd be fussing around with sealants etc. I found this most annoying when I used a heavily saturated ink in it once. I had trouble cleaning mine and I spent ages flushing it. When I went to dab it dry with tissue there were still traces of ink found in the nib collar. So if you like using heavily saturated inks in this pen, you need to spend a bit of time cleaning it out.
3) The piston filler whilst wonderful (I love piston fillers) also needs a special tool to open up should you wish to lubricate it - Montblanc charges a small fortune to do this so I had to buy the tool myself (which also opens my Pelikan M800). I also had to clean out the ink window after using a particular brand of iron gall ink which left a residue on the inside. Once opened, it was just a matter of using a cotton bud to clean it and it looked good as new. My Pelikan whilst needing a tool to open the piston (for lubricating purposes) was easier to clean in that respect because the nibs unscrewed easily and I could clean the barrel from the front.
Much of what people have said about it I do agree with (such as being overpriced when bought brand new) but I am sure there are plenty of good well kept second hand ones floating around should Centurion feel the need to try one (apart from the slightly sprung nib, the rest of my pen was in flawless condition). I have not had the pleasure of owning or trying out a vintage MB yet so I cannot comment but I do love flex nibs too!
Edited by Tritonus, 03 July 2014 - 04:27.