I enjoy writing with my fountain pens (I own a Lamy Safari and a Pilot Metro). But, there are some real-word gotchas:
If you travel, large increases in elevation will make the pen burp up some ink. So I always pack mine in a separate baggie wrapped in some tissue paper.
If you run out of ink, refilling it on the go is a royal pain in the ass. Once a fountain pen becomes your daily writer, you need to have a spare pen on hand. The Lamy has a convenient window to indicate the ink level, but it isn't 100% reliable. Personally I just use a nice gel pen that is wet enough for my taste as my backup.
Lamy cartridges are expensive. Expensive enough that I've switched my Lamy over to piston fill with a so-called "converter" to use a bottle of ink that should last years. OTOH, Pilot/Namiki cartridges are very inexpensive and I still use those in my Pilot Metro.