I use the clear blue digital ones - they give you a smiley face at peak fertility times and an open circle at non-peak times. I have found them very easy, although they are expensive so beacuse of that I use the clearblue non-digital ones until I start seeing a second line (be aware though that some people have a second line through most of their cycle, I am one of the ones that the second line only appears a day or two before peak) and then move onto the digital ones - I have to say its very sad but I find it very exciting to see a smiley face! I got mine from amazon.