I have two Credo 3-9x40s. Both are new, and I haven't been to the range or afield with them yet, but I can say that the glass, eye relief and eye box are very good. I don't think you'll be disappointed.
I’ve been on a Trijicon kick myself lately and man, the glass has been excellent shooting next to a S&B and definitely has trumped my 3x9 SS HDs by a good bit. Those are the 3-18’s, but I believe soon I’ll have a couple others to compare as well.