I own all 15 current volumes of TDOT and plan to buy the last volume in English, if it is ever translated. I also own Jenni-Westermann and Koehler-Baumgartner. Was it worth the price? No. I hardly ever used it for my studies. I almost never use it now. I found Jenni-Westermann . . . more concise. TDOT is higher critical through and through. . . . I prefer to learn from my reference books, not argue with them. My 2 cents' worth. Mark Eddy