I agree with Somerville-Albers' comments, although it is an almost verbatim review from The Penguin Guide. Eaglen is superb, expressing the full range of Tosca's emotions, a mix of infatuation, jealousy, murderous rage, and despair. The object of her fixation, Cavaradossi, Dennis O'Neill, is up to the task, and the evil protagonist, Scarpia, is convincingly sung by Gregory Yurisich.
The stars here are Eaglen, and the Philharmonia Orchestra, under David Parry's baton. Eaglen's Tosca matches or fairs better than other perhaps more notable interpreters, including Price, Freni, Ricciarelli, Te Kanawha, Scotto, Caballe, and Nilsson. Quite a competitive field !
In short, a top-class recording. And the English does not diminish the impact of Puccini's lurid drama. On the contrary, listeners will profit from understanding the text, and perhaps squirm as the violent plot unfolds.
The most dramatic interpretation of this powerful opera remains the EMI recording (1953) with Callas, di Stefano and Gobbi, with de Sabata conducting [the] La Scala orchestra and chorus.