I really haven't had any issues with ZTE devices at all, I have a number of sierra 885's but these seem to perform at about the same level as the MF636.
I have however noticed more dropouts on XT than what used to happen with the CDMA sticks especially when working out of our Auckland office.
Maybe see if you can find someones device to borrow before making an investment in a $400 device.
I was on the entry level MF626 and have today ordered the MF636 which they're giving me for only an extra $99 as they have credited me the $99 I originally paid.
I have my hopes up now that the 636 may prove more reliable.
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