What I have found is- nearly anything out there will have better sound than SecretAudio. The idea of hiding it all behind the seat is what attracted me to it in the 1st place. The difference is AQ between SecretAudio & a quality Alpine head unit is like night & day. Plus- SecretAudio will suck your battery dead in 2-3 weeks. You have to use their CD changer, the display is so small- it's not worth the trouble- plus, it's not backlit at night (the new ones are)
SecretAudio system is expensive. Add a 4 channel amp like I did & you are at $600.00 & that doesn't include speakers or installation. I'm having the head unit installed on passenger side as high as possible so I can see display while riving but you can't see it walking around the vehicle. It will have a full feature remote.