Purchasing JPT MOPA M7 100w from AlieExpress?

Hey guys, Im thinking about getting the above mentioned machine. Rule 5 says "No Links" so I wont post links to the ones I am looking at, however I have a couple questions.
The seller, CXBGACNC LASER, has two models for roughly the same price ($3,344.43 which seems cheap for 100w mopa 300x300 with rotary).
One model appears in the pics to be all in one, the other seems to have the main system box as a separate box. Is there any difference in how they work? Drawback for one or the other? I do have limited space so the all in one option seems better to me.
Also, are they a reputable seller?
Thank you!