It does seem odd that the salesman would talk you out of it. Rotary compressors have become the go-to in home A/C. Ours is 20 years old and sits idle for 8-9 months of the year. Still works great.
Now that I said that... I made a comment about our 2007 TSX a couple weeks ago and shortly thereafter, the O2 sensors went out... 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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