During TTC I used the internet cheapies and loved them, i didn't actually have a problem with any 'evaps' they were always stark white if not pregnant. The month I was pregnant (11 dpo ish) I did a test that seemed negative in the timeframe window then I returned back to the test hours later and saw the faint line. This prompted more testing and I was infact pregnant.
Tesco tests were fine, clearblue fine, first response fine. All much of a muchness. I think this time around I will hold out until suspicious of an IC before spending loads on further tests. Or, I will use the 'middle of the road' tests which are better quality than the cardboard ICs but are still really ICs..the plastic versions.