I like the Montblanc Le Grande series pens, they are big and fat, I have a weird grip and they fit my hand nicely, SO comfortable to use.
The gen LeGrande rollers and ballpoints run about $300 I believe, WAY too much for such a pen, so I've bought 2 from Narikaa.
What can I say, for a $25 pen they are fine, yes, some of the black paint has chipped off over time revealing the brass underneath (they are fairly heavy pens BTW). I baby these pens, and am not happy with the chipping, what can you do.
I bought them because they are oversize, and so they serve my purpose very well and are a pleasure to use. In one the gen refill fits, the other not.
I've tried the tip reaming out mod, does not work. There are NOT enough threads on the gen refill to screw down far enough to the tip!
As for rep fountain pens - I have one that's absolute garbage, and another, the Copernicus from TTK that has an amazing nib, go figure.