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The cartridge is a Hi-Tec-C, one of the most popular options out there for writing / drafting aficionados. Any pen cartridge has the potential to leak; the Hi-Tec-C is not particularly prone to this problem. I've had a $15 Mont Blanc refill ruin clothing by leaking, but never a Hi-Tec-C. It's distributed as the G-Tec-C in the USA, and is commonly available. There are many sources for refills online and, literally at this very moment, Massdrop has a drop for a set of 10.
My short review: I use mine (original finish w/clip) day-in day-out for clinical notes. Never once has it ruined a suit/shirt by leaking. Replacement cartridges are easily and cheaply available. The 0.3mm is fantastic, my girlfriend loves the second one I got her for lab notes, and I'm getting another for backup. I definitely recommend adding the clip. The Ti finish of the original is very nonreflective and will show the first few marks, but over time burnishes into a very nice stable, uniform, half-matte patina.
My shorter review: This is, without qualification, the best Hi-Tec-C host available for EDC.