I assume it would hold up since it seems fairly solidly constructed, but it would be a big assumption to make without actual testing.

1) Leave the pen vertical, with the tip pointing down for say 24 h. So the ink can flow down. After that keep it in that position until the end of the measurement.

2) Holding the pen exactly vertical measure the ink level. Don’t bother if you get error of say 1-3 mm.

3) Precisely mark the current ink level with something – adhesive tape, permanent market, etc. It is important to be done as precisely as possible.

4) Using a ruler start drawing lines, say 20 cm long. No matter how they are drawn, you need just to be able to count them.
On every 10 – 20 or 30 lines measure how much the level is dropped from the mark you made.
I think 1 mm is hard to measure precisely. 2 – 3 mm can be measured good, and 4 – 5 mm are more than enough.

Say the ink level was 5 cm = 50 mm.
5000 m line with 50 mm ink level equals 100 m line on every 1 mm ink level.
100 m line is equal to 500 lines of 20 cm.
So if you draw 500 lines with 20 cm length, the ink level must drop by 1 mm.

Based on my experience – this is very economic if it is true.
Actually, I think, the level will drop 5 to 8 mm on a 100m line.

I neither used Pilot, nor Uni-ball. The conclusions are made based on what I am seeing on the web.
Pilots have a thin ring on the tip section, and thin tooths on the barrel in the place where they fit.
Uni-balls have a thick ring on the tip section, which is friction fit to the barrel.

The ‘tip section – barrel” fitting systems of Pilot and Uni-ball are totally different and non-interchangeable.
So it is possible that Morning Glory Mach II has interchangeable parts with Uni-ball, but it is impossible with Pilot.

All will be easily seen, if the tree pens are pictured together:
Morning Glory Mach II
Uni-ball Vision Needle
Pilot V5 Hi-Tecpoint

What can I tell based on my experience is that Faber-Castell, Schneider and Staedtler use the same system, so their parts are interchangeable. Caps, tip sections, barrels and the small taps at the and can be exchanged with no problem. Despite they look very different, they have the same fitting dimensions.
(Faber-Castell — VISION 1466 FINE, VISION 1475, VISION 1476 MICRO;
Schneider — all roller balls (with steel point) from the old design, probably the new design too, but not tested;
Staedtler — liquid point 5, liquid point 7, cool roller)

But all that comparison is only for the plastics parts. The metal parts – the tip and its ball can be the same on absolutely different pens with non-interchangeable parts. Or they can be different on pens with interchangeable parts.
Or two exactly the same tips can write different because of different materials. This can not be judged by visual comparison, since for the tip not only the the dimensions are important, but the material and quality etc.

@Peter Parker – Those are some good comparisons, I think that they have their similar qualities as well, although the bodies and caps are quite different, I think the Pilot is closest in physical make up.

@ccorrada – Always makes me feel a little better when I see someone with a similar experience. Glad you are enjoying yours.

or Uni-Ball Vision Needle Micro:
http://officesupplygeek.com/pen-review/uni-ball-vision-needle-micro/

http://www.uniball-na.com/main.taf?p=2,3,11

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