How small are the weight increments, and does that matter?

Increments matter most for smaller lifters and for slow-progress lifts like lateral raises and curls. NordicTrack's Select-a-Weight starts at 10 lb and has 14 settings up to 55 lb; Bowflex 552 has 2.5 lb steps in the lower range; PowerBlock typically uses 5 lb steps but accepts smaller 'adder' weights. NÜOBELL moves in 5 lb increments.