Thanks for the PM SA, happy to help.
To be totally frank, many of the cheap off-brand duel-SIM phones in China are not really that much good. It's like with cheapo off-brand tablets, problems with DOA, reliability and bricking.
AFAICT "MT6575" is only a reference to the MediaTek chipset this device uses. Many devices here in China are called MT6575.
The one that stands out for me is the Huawei Deuce though, appears to be a reasonable duel-SIM Android phone from a reputable manufacturer. Although it's only a 3.2 inch screen with Android Gingerbread 2.3, so it's no EVO LTE.. haha.
Don't know about availability outside of China though, where I am.
Odd thing is though the current top-end Chinese Androids are only single SIM, like the Huawei Ascend P1