Is the Twsbi Diamond 580 Worth the Upgrade? (Eco & Asvine V800 Compared)

Nib Happens

Is the Twsbi Diamond 580 worth the extra money over the Twsbi Eco? And how does it compare to the Asvine V800? In this review, I take a look at the Twsbi Diamond 580 from a beginner fountain pen user's perspective. I'll cover the design, build quality, writing experience, filling system, and overal