I own a patt X JRT and she's best terrier I've ever owned, smashing ratter, very short coat, bushes like a trooper through the thickest cover brambles, blackthorn etc. Doesn't bat an eyelid, will dig to China if she has to. Fantastic recall too, the only bad side is she's feisty with dogs she doesn't know at first.
But I wouldn't sell her for all the money in the world, she suits me just fine!
But a dog is only as good as its owner