I have become very fond of an Acorn brand D whistle. It's black, costs a couple of bucks more than the Generation which brings it up to all of $12 Cdn. It is smaller and has a much sweeter, reedier tone, not as loud as the Genny. When I can't find it and have to play my Generation instead I am dissatisfied, although the latter certainly is LOUDER. The Generation sounds more like a recorder to me.

I play whistle along with about ten fiddles, usually without amplification, so an ideal whistle would be louder than the Acorn but otherwise more like it than like the Generation.

And I fully agree about Robin Williamson's pennywhistle book. Like his fiddle tune books, it has nifty tunes and includes guitar chords (good ones).

Willie-O