I used the 2nd edition of this book (listing Timoshenko as coauthor) more than two decades ago as an engineering student. I liked the book back then, and it turned out to provide a solid foundation for my engineering career. I just finished reading the entire book again, cover to cover, to refresh my theoretical knowledge. I found the book to be just as good as I remember, and of course my professional experience enabled me to appreciate the material even more deeply than before.
Gere and Timoshenko give us the details and derivations needed to bring out the theoretical beauty of the subject, they provide plenty of example problems to illustrate the concepts and problem-solving techniques, they note many practical points which help to connect the material with professional practice, and their writing is clear.
In comparing the 2nd and 7th editions, I would say that they're generally very similar, as one might expect. Moreover, I'm not sure that the 7th edition is necessarily better than the 2nd. For example, while the 7th edition touches on a few additional topics such as fatigue and stress concentrations, the 2nd edition is more thorough with regard to inelastic bending of beams and energy methods. I also find the simpler visual presentation of the 2nd edition to be more elegant.
But regardless of which edition you consider, this is an excellent and classic book on mechanics of materials, so I definitely recommend it.