Hiya, i second the opinion above. Also, have used the cbfm and greatly recommend it. Takes all the work out of the opk's and tells you when you are about to ov so you can really time the bd
I got mine on ebay last summer. The month i conceived i was due to ov 2 days later than the monitor showed so i do think it helped. Although i conceived in dec i have to add there were a couple of months the bd wasnt up to standard if you know what i mean, lol..so overall it took me perhaps 4 months. Not bad for someone who was 37 at the time.
Since the mc things have been a bit up and down but the cbfm has adjusted and i still love it as much as before! Get a cheap one on ebay!!

,Omi xxx