Nothing wrong with walmart. You can get a midgrade Pioneer head unit at walmart; same model you can get elsewhere. The fact that you can buy it at walmart has nothing to do with it.
Sony Xplod products are as a whole crap. Their subs are crap, their speakers are crap, and their head units are semi-crap. Their amplifiers are a whole new definition of crap, and what's worse is that they don't sell for crap prices. They're overpriced for what you get. $47 for a plastic speaker? really?
They're labeled as Polyolefin. You know what else is made of Polyolefin? Dishwasher safe food containers; tupperware/glad containers, etc. They're advertised as having "piezo dome" tweeters. They're not piezo tweeters. Google the term if you're not sure. "A
piezo (or piezo-electric) tweeter contains a piezoelectric crystal coupled to a mechanical diaphragm." These are plastic or thin metal dome tweeters, which generally sound harsh and flat out bad. Lastly, foam surrounds. Really? No speaker surround degrades faster in automotive environments exposed to summer sun and temperature changes than light, porous foam. Rubberized foam would be significantly more durable. If I wanted something cheap and crappy, I'd buy something like this and have the same end result:
http://www.onlinecarstereo.com/CarAu...rm_GS260S.aspx
http://www.onlinecarstereo.com/CarAu...le_PL63BL.aspx
Actually, scratch that, I think the above speakers are better. The Pyle speakers even have a rubber surround.
For a price similar to those sony 6.5" drivers listed, you could buy the following superior products:
http://www.onlinecarstereo.com/CarAu...MTX_TN653.aspx
http://www.onlinecarstereo.com/CarAu...TS-G1642R.aspx
http://www.onlinecarstereo.com/CarAu...ate_R1653.aspx
http://www.onlinecarstereo.com/CarAu...udio_VX_6.aspx
The Massive Audio coaxials for example are worlds above the Sony ones listed earlier for $2 more. Much bigger motor structure (meaning, they will get louder and stay distortion-free), a proper silk dome tweeter, and better materials all around.