For the record, "blowing out" an air filter for a vac is pretty much a guaranteed way to destroy it. Compressed air applies too much pressure which forces the pores open. Filter then clogs less after that - it is not filtering anymore..
With auto-clean vacs some folks do this intentionally as they are OK with not-perfect-filtration e.g. on brick/concrete building sites which are dusty anyway, etc. But it is important to understand the effects of such an action.
For an air filteing unit, that is the LAST thing one wants to do to a prefilter. The dust which will then get through will clog the (much more expensive) "main filter" which otherwise acts (mostly) as a backup for stuff that gets through the prefilter.
On the other hand, gently vacuuming a filter from the "dirty" side may be fine once or twice before it is thrown out. The pressure applied must not exceed much what the unit experiences during normal operation.
For those looking at this as a shop-use tool for (semi)pros, IMO that is a bad idea. Just looking at it there were many compromises made to fit the size and weight form factor Festool needed.
I do see these as great for well-off hobby users where it can double as a mobile home air filter as needed and the duty cycle would not be that much anyway, keeping consumable costs in check.
