OK, I went to Guitar Center and tried the GMX212 vs the Spider II 112. I found the tone of the Behringer was not as much to my liking as the Line 6.
You can not retreive the Behringer's amp models
via the midi floorboard. You CAN switch channels (there are 2 channels and they can be clean or dirty). In theory that should not be an issue but I like that the Line 6 CAN do it.