The suppliers are marketing it. Need say no more about the results they might band around to entice new buyers.
However, I look at it this way; do I want to encourage susceptible colonies and be locked in to costly treatments for ever and a day (yes, even if it works, they have got a captive market as soon as it is used!) or do I simply get rid of the susceptible genes, from the apiary, by requeening?
And then there are those susceptible lines spreading their genes around so my other colonies become reliant on treatments (they have really got me by now, haven't they?) and my bees are spreading the genes to perpetuate the problem all over the local area (that is good news for the suppliers, isn't it!).
No, may not be snake oil, but it may be the suppliers who may just be the 'snakes in the grass'. I would not even try it. There is a much better solution, to the problem, for me. I would requeen.
So, no experience and won't be getting any either.
RAB