They've got a single plant in Belleville, IL...they aren't very feature-filled but are relatively solid. They (I think) make many of the 20" and all of the 24" ranges for all mfgrs (on an OEM basis...kind of like Frigidaire makes all the 40" ranges for all mfgrs).
Growing up we had an odd-sized GE electric stove (only size which would fit and allow us to have a double sink, dishwasher and stove lined up side by side without impeding traffic to the back door/downstairs) which we needed to replace--P-P was the only one making the right size (my dad and I ended up replacing 3 of 4 elements and 1 of the pushbutton switches, as I recall)...soon thereafter moved into a house built in 1960 with the original Youngstown-Tappan coppertone 36" cooktop (with rotary 7-heat control) and the original Youngstown 30" dishwasher (which we replaced w/in the first month--ended up with a POS Kitchenaid in 1978 which crapped out within 10 years)