Amy at the front desk is extremely friendly and professional.  I wanted a used engine, low mileage, with a warranty and she found me exactly that.  Quoted me close to a week to get the job done.  Amy called during the tail end of the week and explained in great detail what happened.  Their mechanic put in the replacement transmission and there was no reverse.  They were working with their supplier to get a new one but the supplier was doubting that the one they sent was bad.  Precision had to break down my instrument panel to verify that it was not an electrical issue before the supplier would give them another transmission.  The job took about two weeks instead of one to complete which they were very concerned about would make my own transportation difficult.  Luckily I had another vehicle so it wasn't a problem on my end.  And I didn't have to worry about any additional fees for them doing the job twice.
I'm extremely pleased with their service and come back to them for all my auto service needs that I can't perform myself.  I especially appreciate their level of detail in what needs to be repaired, why, and anything else I should be aware of.  When I picked up the truck the mechanic mentioned that my torsion bars were at different heights (which he fixed)  and that I had an exhaust bracket missing which I opted to take care of myself. 
Precision is friendly, they do a good job, and they stand behind their work.  What more could you want?