Thomann Irish Whistle C

Bought this because I did not have any all plastic whistles in my collection. Was hoping it would be a cheaper alternative to the Susato whistles I have seen. Unfortunately, I find that although I like the overall sound and the feel of it, it handles poorly as it takes a lot more puff to play than my Clarke, Generation, Dixon or Feadog metal whistles and tends to split a lot in the second octave with a really nasty sound on certain notes. The Thomann D whistle I also bought has the same problem. I may do some experiments to see if I can modify it to improve it a little but at the moment I've put it away with my other duds. Maybe a better player than me could get it to behave but given that I have a much easier time with other whistles, I think it's just down to the design being not quite right.