Hmm, fist of all, thanks all for the reactions !
Still, however, I'm not convinced (sorry >.<). My primary concern remains: will the whistles be in tune. I've browsed through the whistle shop page, for instance, and the 'tweaked' whistles improve the sound of the whistle, the amount of air required, the 'stability' of the tone, sometimes even the shape of the fipple... but it doesn't say anywhere that the instrument gets tuned correctly (which seems impossible anyway - isn't that a matter of where the finger holes are placed on the instrument and how big / small they are ?).
It also concerns me that neither for the sweetone, nor for the generation whistles, the site mentions anything about the instruments being off tune. Which is clearly a large problem. Or either I'm just unlucky that all 4 of my whistles (the 2 sweetones, a generation D and C) are / were out of tune ? Also the other sweetone D and generation Bb that I've heard being played by a friend were similarly out of tune.
Unfortunately, the only 'expensive' whistle I have experience with (session-wise) is the Overton - which is of course in tune, but whose sound (character,... even look :p ) I don't like.
Oh dear, I just don't know what to do :/ What would be ideal, is a shop where they have all of those inexpensive whistles, and where you can try them first before buying them - then I'd just have to bring someone with good sense of pitch and a correctly tuned instrument (e.g. my box :p ) and then I'd just buy the whistle that has the same correct tuning... but such a shop doens't exist in Belgium - if it even exists anywhere in the world :/
I'm sorry if I seem disrespectful towards all the advice you give, I really don't mean to, I really do appreciate your help !
I guess what I'll do, is buy a whole load of whistles from that site and just play the 'best' one of them all then...
Btw: the Humphrey looks nice too though. But I don't like the part about 'the best flattened 7th is achieved by using OXXXOX rather than OXXOOO' :p
Btw2: i'll record the whistles over the box so you can judge the off-tune-ness yourself :x
Edit: Here it is.
First one are just scales, one with C# and one with Cnat (I think the Cnat is most off)
Second one is the tune 'Out on the Ocean'. Bear with me what the accordion concerns - only playing for a month or two and don't have a teacher :( (hidden request: any box player who wants to 'coach' me online ? ^^ )
oh - that's the sweetone. the generation is much worse :x