No aftermarket company is putting the Sat tuner inside the radio.  There is a reason for this and its heat problems.  Think why are all the manufactures doing this if it was not the smart thing to do.  Only the OEM manufactures are installing it inside the radio.  The complaints from customers of this style are the CD are very hot when ejected.  Heat is a stress facture and can cause many issues.  Maybe the OEM radios just like selling you new radios every 2 years.
The afternarket radios have a special plug on the back of the unit just for the Sat tuner.Once plugged into that connection, the radio acts as it would if it were inside the unit.  All control and all sreen functions.
If there are improvements in the Sat tech. then you can purchase a new model to plug into your aftermarket stereo or if you own OEM factory you can buy and new complete radio.