The present paper aims to investigate EFL instructors? perceptions of Cambridge English Unlimited (CEU) textbooks taught at Taif University English Language Center (TUELC) in the Academic year 2017-2018. To achieve this purpose, the researcher attempted to answer three questions. The first investigates instructors? perceptions of the textbooks. The second question aims to find out the features that add to the strengths of the textbooks. The third question is an attempt to reveal the shortcomings of the textbooks from the instructors' perspectives and their suggestions to overcome these drawbacks. A questionnaire of 4-Likert scale was used to gather data from ninety two instructors to answer the first two questions, and content analysis was used to answer the third question. The collected data were analyzed in the form of descriptive statistics, using means, standard deviation and percentages. The results showed that instructors have a very positive attitude towards the textbooks in terms of the criteria and features investigated in the first two sections of the study tool. These answer the first two questions. However, they had certain concerns and suggestions in aspects other than those included in the study tool. These have been summarized according to their frequency of occurrence in the instructors' responses. Based on the results, the researcher drew a number of conclusions and recommendations.