I've got one on the Lidl (Parkside). It's handy for sanding up a ladder*, but otherwise not wonderfully useful.
You have to bear in mind that most workshop kit is marginal for the current rating of the switches they use. Then there is the inductive load from gert big transformers (they don't work with 110V kit, or at least I wouldn't try it) .
In the workshop I use a radio remote - cheap, simple, and with a big relay inside that will cope with most small DX loads. If it dies, there were three more in the box (and anyway the relays are easy to replace). If a power take-off circuit dies, it could wipe out the vacuum (depending on the electrical design).
Besides all the above, it either doesn't stay on long enough, or doesn't go off fast enough. The remote lives in a pocket, or on the bench, and works just fine, although sometimes it needs two pushes to 'wake the system up' and then operate it. I think this isn't a fault but a feature to save battery life.
E.
* I know: before someone else says so, "why not put the ladder on the floor and then sand it?" (homer)
