Not long ago purchased the Festool ETS EC 150/5. It is a nice sander.
At the time I was trying to figure out if the central dust collection system could be used effectively with this sander, instead of a dedicated (and expensive) vacuum.
I even put a vacuum gauge on both trying to determine if the specialized vacuum would have 'higher vacuum values' than the dust collector (a clearvue 15" impeller). The gauge I had was a little too crude for my liking, but I could read no noticeable differences between the two. Obviously volume of air moved is more than sufficient on the dust collector.
In practice my experience has been that the dust collection system works fine for the task.
For anyone making similar decisions.