Here was a good thread on the subject of the Starkey Zōn, which is the same as what Micro Tech call the Curve. Same aid, made by the same company, just badged for Micro-tech. Anything you read about the Zōn is therefore applicable. Starkey claim it is best in class and have some pretty compelling evidence to support that.
Here’s the link with lots of information for you:
http://www.starkeypro.com/public/products_solutions/hearing_aid_devices/zon_series/index.jsp