If your opinion of the value of your property differs from the Assessor's, by all means, go to the office and discuss the matter. The staff will be glad to answer your questions and explain how to appeal if you cannot come to an agreement. The Assessor's Office relies on the property owner for information. You can help by providing accurate information.
If you feel taxes are too high, you should make your opinion known to the proper taxing authorities. Be sure to take advantage of the state's property tax relief programs.

To summarize:

STATE EQUALIZED VALUE (S.E.V.)
equals...half of the Appraised Market Value

CAPPED VALUE
equals...last year's taxable value increased by the amount of the Consumer Price Index (with a maximum of 50%) plus construction changes.

TAXABLE VALUE
equals...the lesser of the State Equalized and Capped Values. The Taxable Value will be used for the calculation of property taxes.