and in some ways not quite as good as the XLT.
Let me try to explain my feelings here by telling you that I am, and have been, a fan of White's detectors for decades. However, while I am partial to many White's models, I don't care for all of White's models.
As for Minelab, I have had my favorites with their product line, too, but not as many models. Some of the Sovereign's I had I liked, as well as the six Explorer's (3 XS' and 3 II's), however their weight and poor balance were what have kept me from enjoying a Minelab product due to my health issues. That is, until the X-Terra series came along.
The X-Terra 70, in particular, has been rather impressive and I have found many functions it has which set it apart from a lot of the competition. The X-Terra 70 and the Explorer II are, in my opinion, the two best models Minelab has going for them right now. They compliment each other and, as I look at the whole picture, that's how I have felt about the XLT.
That is, while the XLT, like the X-Terra 70, is a very good detector with some very nice features and performance abilities, it doesn't excel in all aspects and is best considered as a supporting-role with another complimentary make/model detector.
You asked if the X-Terra 70 is as good as the XLT for "coins and relics" and I will say they both have their strong points. The White's XLT allows the operator to manually adjust the GB, but it's a pain to do. You can get a quick "auto-balance" of sorts with the Air/Ground technique, but it also isn't the best or easiest. It does have AutoTrac