How bulletproof is XY when running modeless?

[Mesh]

I was wondering if someone could enlighten me as to how bulletproof XY's modeless functionality is. Are there any caveats? I wanted to make sure there wasn't an increased likelihood of data corruption or crashing if... oh, say there were five copy operations, three delete operations, and four move operations all occurring simultaneously (other than caffeine overdosing, that is).