1. More keys ≠ more notes. On double-deck chromatic kalimbas, some upper tines simply repeat notes from the lower row. Always count the real notes and octave span on the key diagram — not the total keys.
2. Two layouts. Redundant (some repeated notes; easier octave chords and smoother runs, but a narrower real range) vs. non-redundant (every key a unique note; wider range, but trickier passages). Check the diagram before you buy.
3. Why repeats exist. They make octave chords and melodies easier, and a bigger body adds resonance. But range beyond what you actually play just adds weight and strain.
4. Sizing. For most players, a 34/36/42-key chromatic covers the notes you'll genuinely use, in a lighter, more comfortable package. 42-key LingTing (C-tuned lower layer, #C-tuned upper) gives you the full chromatic set with all sharps and flats — a balanced pick for most players.
5. Checklist.
1. Real note count & octave span (not total keys).
2. Redundant or non-redundant layout.
3. Truly chromatic (all 12 semitones) or just an extended diatonic?
4. Does the lowest note cover the songs you play?
5. Does tine spacing suit your hands?
6. Tine material and adjustability.
7. Do you actually use sharps/flats?
8. Weight and portability.
Bottom line: count the notes, check the layout, and pick a size that fits how you actually play — not the biggest number on the box.