Excellent everyday pen
I have been using TWSBI pens for some time now and as far as a fountain pen built for everyday use, this is my favorite. Yes, it's an acrylic but not cheap looking or with a cheap feel. It's piston fill is easy to use and the ink reservoir is large. I like the medium nib - it never skips and is especially sturdy. I like my fountain pens sturdy with no fru fru which just adds useless cost. I think the price for the ECO makes it a great value.