Has anyone had a revision with Dr John Alexander in Dallas

Hello Everyone, I am considering a revision to a RNY.  I had a VBG in 1999 by Dr. David Hall in Lubbock Tx and lost 135lbs.  I have put 70lbs back on.  My husband and i went to see Dr. Alexander.  He claims that he's an experienced revision Dr. in Dallas and he does over 150 revisions a year.  I have heard that with revisions you don't loose as much weight as you did the first time.  Dr. Alexander has told me that is untrue and he believes you do better because you know the do's and don'ts.  I'm just concerned that i'm going to go under the knife AGAIN and only loose 60 or so pounds. Any feedback is greatly appreciated.