Cypres meets all needs and wishes of today's skydivers. Once it is installed, you can't hear it, you can't feel it and you can't see it.
Cypres is great tool.
Airtec is almost a monopolist in AADs and I think this is a reason. Costs of making cypres is not so big and Airtec shouldn't earn so much money on our safety. I have a few good engineers in my job and they told me that construction of cypres is not so complicated and price should be lower. This is why in my DZ only a few skydivers have a cypres. Not having one is like not wearing a helmet on a motorcycle and hittin' the track.