Head unit change tacoma 2006

Hi everyone , im a new owner of a 2006 white tacoma ! Im begin to do some modif on my truck and found this forum very helpful !

im about to change my stereo head unit in my truck ,
(this is standard head with one cd non-JBL) and want to change for a non-JBL [COLOR=black][SIZE=3][SIZE=5][COLOR=black][SIZE=3][SIZE=5][COLOR=black][SIZE=3][SIZE=5][COLOR=black][SIZE=3][SIZE=5][FONT=Arial][SIZE=2][SIZE=5][COLOR=black][SIZE=3][SIZE=5][FONT=Arial][SIZE=4][COLOR=#003366][SIZE=3][SIZE=5][COLOR=#000000][FONT=Arial][COLOR=red][COLOR=#0000ff][COLOR=#ff0010][COLOR=#ff0000][COLOR=#000000][SIZE=5][SIZE=5][FONT=Baskerville Old Face][COLOR=#0000ff][COLOR=#000000][B]A51865[/B][/COLOR][/COLOR][/FONT][/SIZE][/SIZE][/COLOR][/COLOR][/COLOR][/COLOR][/COLOR][/FONT][/COLOR][/SIZE][/SIZE][/COLOR][/SIZE][/FONT][/SIZE][/SIZE][/COLOR][/SIZE][/SIZE][/FONT][/SIZE][/SIZE][/COLOR][/SIZE][/SIZE][/COLOR][/SIZE][/SIZE][/COLOR][/SIZE][/SIZE][/COLOR] (6 cd+mp3).

I read ,on this forum , that this head is made for a 7 speakers system ,i want to know if someone as tried this .... if the sound still decent ,no difference or its not a good move ?
thanks