Doyle Brunson's Super System 1 + 2

[Ivanapolis]

Hi all,
I received Doyle Brunson's "Super System 2" two weeks ago and I think it's excellent. But I read in the foreword, that "This book is not meant to replace the original Super/System (1)....".
Does anyone of you own both books? Is there any interesting stuff in SS1, that can't be found in SS2; or is it useless to buy SS1, if you already have SS2?

Best Wishes

Ivanapolis