I guess more than anything you need information. Take a look at the current statistics for revision from HR to THR over the number of years that they have been gathered and you can see that HR holds up well. Look at the raw statistics from Australia, etc., not as they have been filtered by the press, and also look at both the statistics for THR over the years.
As far as I know, we are talking about failure rates in the single digits, which given the way medicine works and the fact that surgery is performed by human beings, is extremely good. This does not play down at all the problems that people have had, especially since we've gotten to know some on this site.
We've seen Danny's fight to get to Mr. Treacy, and while I don't envy his path to him, he definitely battled his way to him. I think he can give you advice on how he did it (sorry Danny, throwing you under the bus on this one), but most of all, consider the invasiveness of the THR versus the HR. I try to avoid promoting HR too much to someone considering it, since it is such a personal decision, but now in particular, there is so much misinformation out there, it's hard to see good people maybe make a decision on an imbalanced presentation of the current state of affairs.