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I just got my new Karas Kustoms Fountain K EF Friday. I haven't had it that long, but in the time I've had it I've made an observation on the issue of the pen spitting out ink on the page after refilling. I made sure to read every review on the Fountain K, on this forum and every other review I could find, before making my purchase. Many of the reviews on this forum mentioned a "burping" issue whenever they first start writing again after just refilling the pen. Some of these reviews were older and I couldn't find any other reviews off-forum that mentioned the issue, so I hoped that it was just a quality control issue that had been fixed. I found out when I first filled my new Fountain K that I was wrong. First of all, the insert that comes with the Fountain K suggests keeping the converter attached to the nib unit while filling. This may be standard practice, but I wouldn't know. In my time with the Lamy brand I've always taken the converter out before filling. It just seems logical and way less messy. Since I've never had a problem, I never watched or read in-depth on how to properly fill a converter pen. So, I decide to try it their way. They are the pen manufacturers and they must know what is what. When I did this with the K5 converter that came with the pen, there was not enough suction. There was a sizable air bubble at the top, no matter how slow or fast I filled the pen, or how much of the channel I covered. When I started writing, there came the ink burps. Three good splotches on my paper. I un-filled and re-filled. Same issue. I dabbed and cleaned the channel and wiped the pen of excess ink, and it happened every time. So I took the converter out and filled it directly. Not only did it fill to the top, but after a little blotting of the end, it wrote without issue. No burps, no mess. And I've done it this way several times. Now it writes like a dream. I guess the discussion I'd like to have with other Fountain K owners is this: did you all have this issue? Do you think this is a quality control issue? Did you fill the pen like the insert says or strictly from the converter? Since a lot of the reviews were older, where are you guys now with your Fountain K? Did you resolve your issues? Are you happy with your pens? Since the Fountain K uses the same nib unit as the Kaweco, do any Kaweco owners have any issues with burping pens? If so, how did you overcome them? I guess I'm just hoping this is a permanent fix. The Fountain K is definitely the best pen I have used. I love everything about it, from the smoothness to the durability. I don't want this to be a flaw that continues to bug me years down the road. ETA: Fixed messed up tags

I frequently read warnings about the potential for clogging pens with pigment inks. Is this based on any actual evidence or is it mainly hypothetical? Can anyone provide experience either good or bad with pigment inks in fountain pens?