Has Anyone Used Agilent 5975B?

[chemicalenvy]

I need help. We need to buy a new GC/MS and have received a really good offer on an Agilent Model 5975B. Does anyone have any comments or recommendations about this model?
Does anyone know the difference between the 5975B model vs. the 5975C model? The "B" model seems like it wasn't in production for very long, and this is our concern.

Thanks!

[MSCHemist]

I use the 5975b as my research workhorse. We bought it new ~2007. I am in the process of acquiring a 5973 for the plant for raw material checks. It seems a fine instrument. The 5973, 5975b, 5975C all share most of the same parts for the source, interface heater/sensor, pumps. Mine is a standard turbo and I replaced the foreline with an Edwards E2M1.5 because the Pfiefer Duo's that come with most Agilent instruments nowadays are trash.

[MSCHemist]

One thing I can mention is mine used to eat repeller insulators frequently. I bought the 2 spring washers and the belleville washers from Agilent (they are just a few bucks) and so far that has stopped. The earlier models just had the one washer. The newer ones have 3 additional spring washers that allow the insulator to expand when the MSD is heated so they don't crack.