They're great. They're actually known as JAIL Wigs in Japan, and you might find a few more reviews if you search for JAIL. Cosplayers like Tocchi use JAIL.
If you enter these keywords "ジェイル ウィッグについて" into your search engine, and look for urls that have domain "http://detail.chiebukuro.yahoo.co.jp" or "http://www.cosp.jp", those are usually cosplayers asking about a brand, in this case JAIL. Feel free to Google Translate if you like, although machine translations are bit awkward.
Skimming it, they say the colours are spot on to what you see, the fibers are plentiful though thinner compared to Classe and Airily, and the quality is good. They also say minimal styling is needed, but I think that might depend on the character. The wig sizes are neither large (Arda) nor small (Chinese).
Here's a spotlight from a magazine:
One caveat: I have never personally used their English site and this does not specifically concern JAIL/Harukaze, but with several other stores (Fantasy Sheep, Lucaille), other customers have said they're slower to respond to their English inquiries (either they check less often or they take their time because it's in English). Haven't heard this complaint about them, but I thought I'd let you know it's a possibility.