Yes you should be worried everything involving ASICS are scammy..
never heard one person that ordered Avalons asic saying "they scammed me"..
i wouldnt trust bfl tho, i don't know if they delivered anything or not but I always had a bad feeling about them and didn't order anything.. even if bfl delivers their customers are already screwed by waiting for it so long. BFL are rich and laughing id say.
I heard BitFury is building asic too, that he has a proven history of his works and he knows what he is doing.