ZTE MF288 conflicting specs

I've been looking at replacing my aging Huawei B890-66 with a Nighthawk MR1100-2A1NAS or ZTE MF288. I found the Nighthawk for $149 and the ZTE from $59 to $79. The only issue is that I can't find concrete specifications on the device. Some Ebay listings claim it has 150 Mbps Cat4 LTE modem while others say it has 600 Mbps LTE-A. According to the specifications it has the MDM9250-1 which is supposed to be X12 or X16. Does anyone have a MF288? Were there different versions with only a cat4 modem?