Having the CTL-SYS since November '15 I thought I should add/share some thoughts of my longer term experience with it, especially since it is now also available in the US.
The CTL-SYS has become my most used vac during the last 6 months. I use it with my jigsaw, oscillating-multitool, rotary hammer and cordless drills/drivers. I use it to clean the cars and on various occasions as of lately also as an air blower. Whenever I need a vac I reach for the CTL-SYS first and only in a couple of cases where I needed more dust/debris-collecting-volume I reached for a bigger vac, never because the CTL-SYS lacked power/suction or for any other reason.
After what Brice said I didn't/don't use it without a filter bag. It's not that they would cost an arm and a leg anyway and if it saves me hassle/repairs later on - totally worth it. Plus it's a lot easier/cleaner to trash a sealed bag than the contents of a container.
What I didn't realize as special at first is that the vac runs a little longer after the tool stops drawing power from it in automatic mode, I kinda expect this because it if very useful - especially when drilling. But a pro who borrowed and used my CTL-SYS when he was working for me was actually pretty excited about that among other things like: size, weight, connectivity and power. Seems not every (shop) vac with integrated outlet runs a little longer than the tool does. I guess we have another convert, he definitely wanted to ask his boss to buy one.
The truth is that everyone who I showed this little vac to was pretty excited about it and I'm too till this day.
I really didn't come across anything new that I didn't like.
As I didn't use it yet while sanding/grinding I really can't tell if the lack of variable suction is really that much of a problem, sooner or later I will find out obviously and make my decision on that.
Until then I'm tempted to say that the CTL-SYS really is a perfectly well executed little vac.