I have NOT traveled on US 219 north of I-80 (The two roads intersect at DuBois), but I have traveled the rest of US219. I once had to go from Pittsburgh up I-79 to I-80 then I-80 to DuBois. I attended a hearing and the trip was quick, then I had to take US-219 from DuBois to Johnstown. The distance was 1/2 the distance I had traveled on I-79 and I-80 but took me twice as long (more comments on US-219 north of DuBois see the last paragraph below).
South of DuBois (i.e. South of I-80) US219 is a road with a lot of curves, two lane (one lane in each direction) rural road, few lights, but a lot of radical turns as it goes up, down and around Allegheny Mountain. As you cross into Cambria County Pennsylvania, you travel through several large towns (Or small cities, called Boroughs in PA) with a few red-lights in them on US-219. As you leave Carroltown in Cambria County US-219 becomes a four lane limited access highway, it stays this way as it passes Johnstown and Somerset, then reverts to a road with a lot of curves two lane road through Berlin Pa, (Two Red-lights). US 219 does this for about 15 miles and then goes to a limited access highway to by-pass Myersdale Pa, then back to a one lane in each direction highway.
US-219 has several good points, if you go into Myersdale you can take a trip on the Great Allegheny passage, a bike trail from Pittsburgh to Washington DC. Its highest point is just outside Myersdale as it passes through the Mt Salvage Tunnel. The small towns in Northern Cambria County are remnants of the old days of coal mining, poor, no Walmarts so you can see how pre-WWII American was. Walmart does have two stores off US-219, but the limited access part, one on US22 in Ebensburg Pa and another in the Richland Township suburb of Johnstown.
As a Native of Johnstown, I want you to visit us and spend tourist money here, but if you just want to pass through PA, I-79 is faster and safer.
As to the part of US-219 NORTH of DuBois (North of I-80) I believe the PA part is just like most of US219 around me, one lane in each direction rural highway. Timber trucks hit those roads quite well (North of I-80 is NOT generally Coal Country so few coal trucks North of Us-219) but you will be going through Allegheny National Forest, the only American National Forest that makes money do to all the Cherry's in the Forest.
Now on an unofficial site regarding Pa Highways, no improvements have been made to US-219 north of Cambria County since 1946 (when some work was done in DuBois), for more see the following sites:
http://www.pahighways.com/exits/US219exits.htmlhttp://www.pahighways.com/us/US219.html