I can't comment on the Camvac but I do have the AC400* hung up from the ceiling (double garage, half is my 'workshop). The filter is no substuite for good extratction but does seem to keep the place cleaner. It has a timeswitch function so I often leave it running for a while after doing anything. It must be doing something - the filter gets dirty
.
I suppose the real test is to ask myself "If it packed up, would I replece it with another one?". Yes in this case.
One thing I have noticed, if you watch any you tube or similar videos, no 2 turners seem to have exactly the same set up, which suggests that there are many ways to deal with the problem and perhaps none are perfect. After all, if there was a clear winner we would all be using it.
*
if you do get the AC400, the remote control has a fairly short range and needs to be pointed directly at the sensor, I had to re-think where to hang the machine