In-Wall Speakers?

[Newbie_in_Phoenix]

Hi:

I have an old pair of Radio Shack speakers which I purchased about 20 years ago. While they still work fine, my wife has made a few comments about the space the speakers occupy. My question is how is the quality of in-wall speakers by comparison to floor standing speakers? I found a pair of JBL SP8II which are around 300 bones. My concern is will the in-wall speakers have the same depth of sound as the floor speakers? I don't want to go through the process of installing the speakers if the quality is not there. I should note the current system is not used for a TV. I stream the audio over a wireless link from my great room HTR.

Thank you in advance for your opinions!