If you are looking for an excuse not to buy an Ultrex, just look at the price. It is expensive. But, don't think that a brand of graph makes a darn in the decision. You will not have one feature. The contour following feature. That's it. Everything else works on its own.
If I had to chose between my Ultrex or my graphs....I'd keep the Ultrex, it's far more useful than a graph.
Eat. Sleep. Fish.