Those that aren't curved/concave miss a major comfort factor in my opinion.
My personal must-haves for a split keyboard:
- Concave/curved design.
- Thumb clusters.
- Vertical arranged key columns.
- Palm support.
- Fully customizable layout.
- Mechanical switches or anything similar with proper feedback for better typing, and also decent travel distance so it doesn't feel that you're knocking your fingertips on hard plastic all the time.
My personal must-haves for a split keyboard:
- Concave/curved design.
- Thumb clusters.
- Vertical arranged key columns.
- Palm support.
- Fully customizable layout.
- Mechanical switches or anything similar with proper feedback for better typing, and also decent travel distance so it doesn't feel that you're knocking your fingertips on hard plastic all the time.