John is correct on no contact with moving equipment on the debris side of the unit. I use a 10 cu. ft. compactor bag from McMaster-Carr that is heavy duty and much less expensive than the Felder bags. I often re-use the bags. Just like a cyclone, you don't want to overfill the bins as you will end up doing a lot of cleanup. I use the heavy duty Penn State Industries remote to control my RL 160 but mine is a 3 phase unit. It will also work with single phase and it can handle up to 7.5 HP.
My memory has decayed somewhat on the AL-KO units. From what I remember (over 6 years), what struck me the most about its performance was how quiet it was. What also struck me was the price, as I recall it was in the $7K ballpark which was well outside of my price range. If you want a quote on the AL-KO, contact Carl at Martin USA. He will send you brochures and a quote via email. He has been helpful to me in the past and is not a pushy sales person.
I have many reservations for a variety of reasons about filtration claims from many dust collection systems marketed in the USA (including some specified in this thread). Usually, the seller portrays efficiency of the filter (xxx microns @ 99.x% efficiency) and often provides a link to some 3rd party manufacturer of the filter element. I have yet to see any test data representing the overall effectiveness of how the dust collection system performs especially given that all the cyclone units have positive pressures downstream of the blower with fine debris in the stream. Remember the amount of debris that exits the system could be significant and that is the fine stuff that enters your lungs.
On the other hand, I have no reservations about the European made machine claims. Filter efficiency is not referenced but the downstream air quality is. In the case of Felder and AL-KO, it is presented as