I've got a Joe Blow Pro and a 15-year old Silca. For being 15-years old and never having any maintenance, the Silca still works surprisingly well! The air pressure gauge seems a bit funny, but it still pumps as well.

That said, the Joe Blow is superior in just about every way: the gauge is at the top of the pump so it's easier to read, the handle is more comfortable, the pumping action is smoother, the head is easier to use, the hose is longer, the base is more stable, etc. Unlike the Silca, you can frequently find the JoeBlow Pro on sale. I think I paid $50 or $55 for mine during some REI or PB sale. At that price if it lasts a couple of years, which I have no doubt it will, it's a great value...