This whistle is amazing. It’s easily my favorite. It plays easily and the tone is wonderful, powerful, rich, and excellent volume.My wife just commented on how nice it sounds, and she’s not a tin whistle fan. It’s a powerful whistle you can lean into, with a lot of dynamics available.
Glad you like it, it was on my shortlist too, but I opted for a Shearwater, which I am awaiting right now. 
I just played it for the first time last night. I was away on a trip when it arrived. I’m blown away by how great it is. Part of it may be the pitch. It’s still a low whistle, but it seemed richer and more powerful than the MK Low D I had, or any of the other low D’s I’ve played. I’ve not played any other Overton style whistles. When I was playing it this morning my wife and kids all said it sounded great.
That’s two out three votes for a happy wife. I may need to look into this.
This is an alto whistle, yes? can I ask how big this whistle is? I haven’t played low whistles at this point and my biggest whistle is an alto A which feels like a bit of a tank compared to most of my high whistles. Especially my Eb
Significantly more of a tank than an alto A, but more sports car like than a low D.
Re sizes - my low ‘D’ is approx 24", & my alto ‘A’ is roughly 15" - the low ‘F’ is between the two, size wise, (I haven’t received mine yet), but I’d estimate it will be about 19~20" long, & the hole spacings will definitely be greater than an ‘A’ whistle, likely need to use the ‘pipers grip’ to play it, like I do on the low ‘D’.
(Hope that gives you an idea.)
That does help. It is still an alto and not a low though, right? I also need to chill out on buying whistles for a while. Haha
It feels and sounds like a low whistle to me. Like an easier to play, very responsive, low whistle. It seems a lot closer to a low D than an alto A.
From my understanding, reading posts on here mainly, alto is Bb/A/G, then they are low whistles, down to a low C, then they are bass whistles - but I could easily be wrong, just my understanding from being on the forum for a couple of months.
Hmmmmmm… Interesting topic. 
Yes I would also say there is an alto Bb, however there is also a (low or bass?) Bb being made by a few makers. And an alto A and bass A.
Hmmm… I am not sure where alto whistles change to tenor?
Several of the makers that I was looking at for my ‘low’ F call them ‘low’ whistles too, so it would definitely seem to be seen as such, & most regard Bb as alto, whilst a low/alto G depends on who makes it, it would seem. 
I think we need a ‘definitive’ thread for this, so that us ‘newbies’ know the right designation to use. 
Edit: New thread here - http://forums.chiffandfipple.com/viewtopic.php?f=1&t=108061
My Shearwater low ‘F’ just turned up, it is just over 19.5" long, (it’s a nice whistle, too). 