For each bird, Peterson gives field marks, similar species, and where found (overall and within Texas) as the main information; the latter is useful for elimination. Where appropriate he also has sections for voice and nest. The emphasis on field identification is good, with additional sections showing, for example, silhouettes of accipiters, falcons, kites and harriers to show the differences.
However, many of the plates are black and white, or line drawings, and this is a significant drawback. For that reason I'd recommend John Tveten's The Birds of Texas instead, although it's not as handy out in the field, and has less coverage of casuals and accidentals. The organization of the Peterson is good enough that you might want to get both.