Hi Lilly13, I used the Epi-No and felt similarly - I only got about 7cm in the exercises, also wondered if I'd wasted money, also felt that I wasn't doing it for long enough (perhaps every second day, for about 10 minutes!?)
Anyway, I gave birth to a 4.4kg (9 pounds 11 ounce) baby girl and had a second degree tear. Okay, so it was a tear but, with such an enormous baby, I think it would have been worse without the Epi-No!
Perhaps more importantly, I felt much calmer during the pushing stage knowing I'd done some 'preparation' down there. And I personally believe that being calm and taking your time during the pushing stage is invaluable.
And if it helps to reassure you, I didn't feel myself tear - there was WAY too much going on for me to even register. And the recovery was speedy :)
So my suggestion is - keep doing the exercises and don't worry about how much the Epi-No cost. It is worth it for the peace of mind.
PipPipPip
PS. Just want to say that my labour 4 weeks ago was a very exciting and positive experience. It was gruesome and painful, sure, but it went well and I am left with (almost) fond memories. Good luck, you'll be fine :)