Excellent mid-range type receiver. I have one in service for several years and found the tuner good and power output acceptable.
The vinyl can be replaced with more stick-on vinyl or wood veneer if you want to go to the extra effort.
You may want to snoop around at this forum which has a section devoted to Pioneer equipment. http://www.audiokarma.org/forums/forumdisplay.php?f=90
You have what is called a silver face Pioneer from the late 70's and very collectable.
The main age related issues are the older electrolytic capacitors. If the unit was in service and working using it as is probably isn't that risky but you may want to put a plan in place to systematically replace the many electrolytics especially in the power supply and output amps. Once they go on their own lots of magic smoke comes out....