Good replacement for an expensive car radio

I have bought the item instead of a new car radio. I wanted to be able necessarily mp3s listen. Since my old car radio this simply can not, I wondered whether I should buy a new radio. Until I came here to this part.
Instead of an expensive new car radio so I could my tablet (Samsung Galaxy Tab 2 7.0) Connect the car radio. The big advantage was that I knew the tablet software for playing music and I knew it and so can deal with folders, playlists, tags. So I was not angwiesen on spongy statements on car radios.

As I can mount the arachnids Tablet mounts recommend (Spiderpodium or even cheaper models like) that is inserted into the air vents, do very well to the tablet as a MP3 player or even be able to use navigation,

Installation:
You have to expand its old radio and plug it on CD changer input and has already been completed with the installation. The cable I have housed in the glove compartment, and if necessary I'll get the Line In connector out and enclose it to the tablet.

Application:
You have to just go on the car radio to CD changer and press the tablet to play and you can enjoy his music.

A small negative point remains: Playback is at least from my Tablet from too quiet. You have to adjust the volume on the radio and on the tablet very high (max) rules and achieved is still not a volume that it begins to hurt.
I once tested an old USB stick (or Line In), which was much louder. It is therefore not the device but the tablet. (I prefer it even no star from.)

The trigger I give for the price I kind of cable with some electronics in between find quite high (But there are also more expensive ca, 80 Euro, devices that are very similar to this one.

I have not yet tested the USB interface, so can not say anything.