hi there,
a guy i shoot with got some recently i they worked great for us. that good in fact, i was planning getting some myself. hes a great crow shooter and has told me at this time of year the crows are all pairing up so when setting out the deeks place them in pairs together, with some singles scattered around. incoming crows see the singles and think there "available" and come for a closer look. game over for them.
maybe worth a go??
regards Peter