It took my a while to get a VP, a blue-carbonesque number. As soon as I got one I felt like a fool for not getting one sooner. I used that blue puppy every day for a few months, then money got tight and I sold it off. Immediately regretted it, well before I cleaned it up and boxed it out. Then a month or two later I got one in a trade, only a black number. I didn't like it as much as the original blue, so I sold it and bought another blue-carbonesque back in November.
When I got the third (!) VP, I also ordered the two different converters thinking I'd play around with different inks. The thing is, I've run through a box of cartridges so far, and every time I run out I think I'm going to try a converter next. BUT I just can't stand to be without this pen*, so in another cart goes. I guess it is a good thing that I favor Pilot blue carts. I ordered up two boxes of carts, so maybe when I bleed that second one dry I'll flip over. I told myself I wasn't going to buy any ink this year if I could help it.
*Four things I always carry: Watch, wallet, pocketknife and pen
Though I mostly use mine (sorry, plain gray, no "carbonesque") with converter, It is most probably the pen that needs more ink depth in the bottle to be able to be filled (at least among mine ones). Still use the converter, though, as I have plenty of different ink colours and brands. Rgds Martin
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