Yes, it would be - a friend of mine who was LTTTC used it and sucessfully concieved.

It's really good as it puts you more in tune with your cycles. When you first start, it gives you long "red" times, when you need to use another type of contraception, but after about 4 months, you come down to a time of about 6 days which is your "unsafe" time.

It's as simple as weeing on a stick on the days it tells you to and then stick it into the machine for a few mins to wait to see if a red or a green day!