Absolutely no draw backs at all! but remember the pole is only a 12 footer and I hardly ever have it out more than 6 - 7 feet. At that range it is so easy to allow the pole to slide down thro the hands allowing a quick turn-off. Switch it back on and push the pole up again - easy, quick, efficient, economic blah blah blah
Since this version I have now re-threaded the tube thro the pole so its even more tidy than this pic' shows.
Its great to use, just wish I could use the idea on longer poles! - but I am working on an idea which is following the same principle but not sure if it will work efficiently. Time will tell!
I showed it to a large WFP oufit based some 50 miles or so from me a few months back and I am lead to believe they have modified all their shorter poles to this idea so it must be a workable system.