I'll note that if the CT series is too expensive for your tastes, the Makita VC4210L offers similar benefits to the CT 36 AC HEPA (41 liter capacity, similar airflow/suction, HEPA filtration, passthrough power with automatic activation, filter autoclean, and even systainer docking) at about 2/3 of the cost. What you give up is integration with the rest of the Festool system: the fitted, twist-lock hoses, the Bluetooth integration with cordless tools, and the accessories like the boom arm that Makita doesn't offer. Depending upon your use cases, this may be a pretty worthwhile tradeoff to save $300, even moreso if you already have Makita power tools that are compatible with their own Bluetooth module system.