Auto-vacs are still very common in North and particularly West Yorkshire, every Ossett pub uses them (Three Pigeons, Halifax for example), whereas Pivovar pubs (the Taps in Harrogate, Sheffield and York) ban them as disgusting. Also fairly common in Edinburgh where they're called return trays.
Some CAMRA members are fanatically against them while a few others are fanatically pro, the anti's won a motion at a CAMRA AGM hence the symbol in the GBG and an obligation on branches to record their use. I think the return tray designation in GBG is due to the motion coming from a particular fanatic in the Edinburgh branch.
They are acceptable as long as the staff know how to use them and how to hold the glass when pouring. Used that way they're certainly better than staff handling a glass with their dirty fingers on the rim.