when using strategy tester do you check
every tick, control points or open prices only
under model? is strategy tester accurate for backtesting
also?

USE EVERY TICK

Backtester only gives you a basic idea of how the EA will perform, great for making sure your code runs properly. Long forward testing is the only way to really determine how your EA will perform.

use control pts EA kicks ass?

Look at this thread for the links to Codersguru lessons http://www.forex-tsd.com/general-dis...der-forex.html

And we have thread about backtesting Backtesting/Optimization

use every tick

Control points don't take into account every pip that your currency hits, therefore you will not get a somewhat accurate result as to how your EA will perform.