Q. L’kavod Harav
I recently learnt the Halachos of reciting Hatov V’hameitiv on a different wine during a seudah. I never see people reciting this bracha even when all the conditions apply. I am aware that the Minchas Yitzchak (IX, 14) has a Teshuva on it. Is this what people rely on? Should I recite the bracha?
Yashor Koach and Gemar Chasima Tova.

A. Piskei Teshuvos (175: 1) quoting the Minchas Yitzchok mentioned and a similar Kaf Hachaim (175: 11) averts that since so many details have to be complied with for being able to recite this brocho, (see Mishna Berura ibid.), and they are not likely to be met, people avoid reciting this blessing.
Horav Shlomo Miller Shlit’a agrees and adds, that since the brocho of hatov v’hameitiv will be recited at birchas hamazon, one should choose the better new wine for the kos of birchas hamazon, and it will cover the sofek and doubtful brocho on the new wine. (See Beis Halevi on the Torah at the end of Chumash Bereshis, that rules that the hatov vehameitiv of birchas hamazon, exempts all wines of the seuda).

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a