When comparing Pilot Metropolitan vs TWSBI ECO, the Slant community recommends TWSBI ECO for most people. In the question“What are the best fountain pens for beginners under $50?” TWSBI ECO is ranked 1st while Pilot Metropolitan is ranked 2nd. The most important reason people chose TWSBI ECO is:
You can put a huge amount of ink in this pen and write for hours. It is also pretty nifty.
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Pros

Pro Great nib
There are fountains pens that are much more expensive than this one that don't have nearly as nice of nibs.

Pro Comes in Japanese Fine
Japanese grinds are narrower than their western counterparts. A Japanese fine nib is about the same or smaller than a western fine. This can be really great fun and is fantastic for cheap paper

Pro Shape
The shape looks classic and attractive. It doesn't look like a toy. It looks like an actual writing instruments that would be used by adults.

Pro Piston filler
You can put a huge amount of ink in this pen and write for hours. It is also pretty nifty.
Pro Demonstrator
Beautiful clear bodied pens that you can see the ink flowing around in.

Pro Dissassembly
You can take this pen apart and maintain it. It shouldn't need this basically ever, but it's good just in case.
Cons

Con Weight
The brass body of this pen is a bit on the heavy side, but it is ultimately well balanced. Long writing sessions might wear out you out a bit, but the ergonomics shouldn't hurt your wrist or anything.
Con It is more difficult to clean

Con Piston filler
This filling mechanism isn't as easy to use as a cartridge/converter pen.
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