What are peoples thoughts on advanced ClearBlue OPKs? If you have used them, how many days of flashing smileys did you get before your static?

This is my first cycle tracking through OPK. I am on day 3 of flashing smileys.. just not sure when to expect the static... also not sure if I should test multiple times a day? I think the kit only came with 20 test strips.

General thoughts on this OPK vs others? I really like the easy to read smiley.. haha but would love to hear others thoughts and opinions.