The OEM manufacturer is Sunwave Technologies in Taiwan (
[Link: sun-wave.com]), model number SRC-9310. It is sold in the U.S.A. under the Sima label (
http://www.simacorp.com) as the Sima SUR-35.
You might try searching on those model numbers to see if there are any reviews or user comments out there. Also, an earlier Sunwave touch screen model was marketed in the U.S. as the Crisp Solutions UCommand 515, which you can find reviewed on this site.