People don't seem to be distinguishing what I think are two questions - which whistles are suitable for solos, and which for accompaniment? I mainly do the former, so I'm much less fussy. Generations are fine, but they need warming up first - keep a set down your singlet! The old Sharp tapering ones were brilliant because it was very difficult to accidentally overblow them - mainly because it was almost impossible to play them for more than two minutes unless you had borrowed a pair of lungs from a friendly elephant! Nice tone though.