The only issue I have read and experienced with the Borgesen box is the mounting pad may be off when it was welded. Mine (a first generation box) was off by about 3 degrees and angled the input shaft towards the engine. The coupler probably could have absorbed the angle difference but I fixed the alignment with the use of a re-purposed differential shim.
I do not know if the second generation boxes have the same issue. If you do not want to deal with shimming the box, I suggest buying from a seller that has a very good return policy.