Terry is great if you need to know all that there is to know via UOA. He's surprised me quite a few times with asking "you don't happen to be doing (fill in the blank)?" ..and sure enough, I was.. and had not included it in the data email exchange. One time he found something that he couldn't explain "at the moment" ..and it bugged him enough that he began asking more questions. Very thorough service.
He correctly speculated that what showed as fuel in Bruce's 0w-10 might not have been fuel ..and the list goes on and on.
If I was just doing a check up, then a B-S, OAI, or anyone else will tell you if the oil's in decent shape, but if you've got a problem, or are out to see a bit more in depth to what's going on, then Terry can't be beat.