Yep, that's exactly the model I've been eyeballing, for the price it looks hard to beat. I think the Art S8 is the next lowest priced rack mount splitter at ~$240. The MS8000 also seems to get good (enough) reviews everywhere I look. I've got some time to pull the trigger as my new band will be providing PA for our first few shows and we'll have no need to split. I just want to be prepared when we do. Thanks!
For the XR18 inputs I use the link outs on the MS8000. There is a very slight drop in volume that you can easily account for with a few dbs of extra gain and voila! You can also mono sum two inputs with the link button, but be careful not to have it pressed in when you don't want that function.
The FOH gets the balanced DI outs that are isolated and do not have a volume drop. Good luck, its a great buy! I'm going to get another one one day.