Although many people here warned me against putting on a rebuilt unit, I started out putting on a rebuilt Toyota unit from Napa. They were right. After a little over a year, it was leaking. But I just couldn't get myself to spend the outrageous money Toyota wanted for a new unit. Especially since I thought it's performance was marginal on 33s and I wanted to allow for even larger tires in the future.
So I put on the Saginaw unit and I love it. I was lazy and bought a bracket from Iron Pig Offroad. The stock lines fit with no modification (I couldn't believe it either). I also put on a pulley that allowed for the cruiser wide belts. Pretty easy project.
For me, it was a great upgrade. I don't have a smog pump in my rig and this made belts easier for me. I now have two belts running the water pump. Also, the Saginaw unit puts out more boost making turning larger tires easy. I think this is a great upgrade.