Volume: This whistle is on the high side of medium. It'd fit in a regular-sized session.
Responsiveness: Fast. I didn't have any problem playing ornaments up to speed. It didn't feel as lightning-fast as some of my whistles, but I didn't really have any problems with it either.
Tuning: The whistle isn't billed as tunable, but with most inexpensive whistles, you can pull the head off by soaking in hot water to break the glue seal. I've got really strong hands, and was able to get the head off by just twisting it until the seal broke. Go me! In any case, with the head pushed all the way in, the whistle is in tune with A=440. That means you can't make it sharper. Unfortunately, the intonation was not that good. With A=440, then D, E and F were about 25 cents sharp. G was 10 cents sharp, B was about 5 cents flat unless pushed with the breath. By doing super lung gymnastics (barely breathing at all on DEF and pushing harder than usual on B) I was able to bring everything into tune, but those conditions are totally unsuited for actual playing, for beginner or pro alike.
C-natural: OXXOOO produces an c-natural about 10 cents sharp of true. OXXXOO was right on.
Hole size and placement: This whistle has holes are average size and placement. There are no weird spacings. If you can play a soprano D, you can play this one.
Air volume and pressure requirements: This whistle's average in this regard. The 2nd octave takes some push, but not a lot, and I get about a full A part of a reel out of it on a breath.
Clogging: I didn't play this whistle for hours and hours at a stretch, so never experienced clogging. It has a slightly larger than normal wind passageway; between this and the plastic mouthpiece, I would expect it wouldn't be that big of a deal. Plastic mouthpieced whistles are probably the easiest to maintain in this regard. Just blow and go (though some folks advocate sucking the juice out instead..yuck!)