I shifted to writing with fountain pens a few years back. After I joined my job.

I like writing for the pleasure of writing and have written copious amounts of notes. Most of it is circuits, notes, tech stuff, software architecture diagrams, etc.

Fountain pens are the best. For fine diagrams I use Platinum Preppy 01. I just love that pen.

For daily use, I use a normal Reynolds one that costs Rs. 20 (about 30 cents, US).

My preferred choice of ink is Parker Quink. I fill up using a syringe.

Can never ever write with a normal pen. However, I am forced to use ball pens on older paper as fountain pens blot a lot on yellowed out paper.