I wanted to start learning to play these type of instruments and thought starting small would be a good idea. I bought this ocarina, because compared to its counterparts, this one has a transverse-like design. And it's shaped as a sharp tooth, which is kind of neat.
There are a couple of things I've noticed; 
1) On my ocarina, the high tones tend to be a little flat, but with the right breathing I'll get it very close to what they should be. 
2) The fingering sheet denoting the tones from the instrument are in key C while this is a key G instrument. It doesn't change the operation of course, but you'd need to source the right chart from somewhere else or make it yourself. 
3) Tone range is from G5 all the way to A6~B6 depending how much air you give it. This thing can shriek! :D
Overall, I'm really happy with it. It's design, tone range, the finish. Lovely ocarina to have.