I just tried to import an OBJ exported from 3DS Max using SI's native OBJ importer and it failed! No crash, just no mesh imported.
I started to think maybe there was something wrong with the file, then I used a 3rd party obj importer (the gw one) and everything came in fine!
So basically, SI can't even read in a very standardised exchange file format from another of AD's products, and this has been flaky in SI for quite a few versions now!