As a keyboard player who picks the sax up mid song for the odd sax solo I generally have around a bar left by the time the sax is at my mouth - no time at all to faff about wetting a reed; and for most sax solos I need to start bang on with confidence. You can't mince gently in playing in a classic rock band. These plastic reeds are just awesome for that - just pick up and play, no prep. And they seem to last for ever too. No doubt "proper" sax players will have a skeleton full of bones to pick with this non-traditional reed, but frankly it plays consistently, and on demand, and I get the sound I like out of it. 'Nuff said.
Update - Mar 2021. Been using these nearly a decade now, still buying them! They don't last forever, but they last a very long time.