Hi Minnie, welcome to the site. You join several great spouses who are helping their husbands or wives to face their OA.
I think you'll find many people here who have been helped greatly by the BHR. There are other devices also used by good surgeons, so the choices are not limited to the BHR; it is the longest used device, and has a great record.
I don't know Dr. Evans, but he is listed on the list of doctors that Pat has made available. Here is the link to reach the list http://www.surfacehippy.info/listofdoctors.php
you can see that he has performed 128 resurfacings. He was trained by one of the best surgeons in the world, Mr. McMinn.
The success of a procedure depends on several things, the most important is the skill and experience of the doctor. Ideally, he or she has done a large number of resurfacings, does them often and is committed to the HR procedure. Pat has also put together a list of questions to ask your surgeon, the link for that is here: http://www.surfacehippy.info/questionsfordoctor.php
She also put Patricia Dukes' article on how to choose both a doctor and an HR, which you may find informative:http://www.surfacehippy.info/questionsfordoctor.php
Personally (and this is my own opinion), I chose my doctor because he had over 800 procedures done at the time. He also performed three or four HR procedures per day, the hospital was well set up to handle HR and THR patients, and the followup for aftercare was thorough.
I think that this is a procedure that you don't need to have done in the same place you live. Many folks here have traveled to have it done, and the care afterwards was done by local doctors. You don't have to feel that your only option is the one doctor. You can choose from other surgeons that are farther away and have more experience, if you end up not feeling comfortable about the one you have. You definitely have good options.
This is not to say that Dr. Evans won't be the best surgeon for you, just that you have options and are not limited to local doctors. Many of us have traveled and done well. Please look over the stories of the many people who have. If you wind up choosing Dr. Evans, at least you'll have done so after comparing with others.
There are doctors who will give a free assessment of your husband's situation on this site, who have a lot of experience. You could send them his XRays, get information that will help him make a good decision.