I have used it once for Crows on a large sky light, the crows were pecking at their reflections and damaging the window rubbers causing them to leak.
Netting was out of the question and shooting wasn't an option, I spoke to Nigel Battern at KG and he thought that the Bird Free would work, and it did!
I felt a bit stupid telling the client (A company directory of a very large national chain) that the birds would think the window was on fire, and no longer return. But after the client researched the product he was willing to give it a try, within 48 hours they had stopped.
Its been about