I installed a Retrosound Redondo and I'm very pleased with it. I can't remember what I paid, but I got it from Amazon at well below list price. I'm using my factory bezel and knobs, so it looks 100% factory until it's turned on, which was a personal requirement.
I fitted a pair of small speakers in the front speaker opening on an adapter plate that I made. In the back I have a pair of 6x9s in the package tray, inside foam speaker baffles. I enlarged the rear speaker openings in the package tray so I could drop the speakers in from above, instead of mounting them from below the package tray.