Let me start by saying I really like the idea of the passive skill leveling boosts from the Air Filtering Unit and Library. As it stands, leveling endurance, strength etc. to max can take well over a thousand raids while playing normally. Using the hideout to unlock ways of expediting the soft-skill leveling process is a great incentive to upgrade your hideout.
However, I have a couple big problems with the Air Filtering Unit:

1. At the moment, FP-100 Filter Absorbers are about 350-400k for 20 hours of use
2. The absorber cannot be removed from the unit, and is consumed even when you're not online

As it stands, getting the Air Filtering Unit in your hideout takes a lot of time and resources (L3 generator, L3 vents, L3 Skier, $10,000), and keeping it up and running is expensive. I feel obligated to keep playing while my absorber is depleting. A couple comprises could be:

1. Making the FP-100s only deplete while in raid
2. Changing the crafting requirements to cheaper or a smaller quantity of items

Let me know what you guys think about it. Hoping Nikita will see this and give his input on the matter. :)