The extra "bells and whistles" as noted in the previous posts really are worth the extra money if you can afford it. The X-50 is not a cheap detector, so spending a little more to me was worth the investment. If your on a tight budget, the X-50 will serve you well, if you a afford a little more, go with the X-70. The prospecting mode is also very useful for finding the size and shape of a buried object. You can outline the object in the prospect mode, just one more bonus. Which ever you choose, you will be very happy with the finds made. The X-Terra detectors are the best for the money.
Good hunting, John K