This paper presents ERP systems in enterprises from end-user perspective, in order to help businesses to get the maximum from their ERP systems in meeting their needs, and thus achieve the benefits for whole enterprise. A review of the relevant literature has established that the ERP system evaluation within the benefits for enterprises is possible only from the end-users perspective, which implies an evaluation of the quality of the ERP system. The main objective of this paper is to determine the positive relationship between quality of ERP systems and business performance. The subject of the research was theoretical and empirical analysis of the quality of ERP systems in medium and large enterprises in Bosnia and Herzegovina, and relationship with business performance of these enterprises. After the pre-research provided a statistical set of 335 companies that use ERP system, a questionnaire was conducted to determine the quality of ERP systems in enterprises. Correctly completed questionnaires were collected from 79 companies. To investigate the other variable, business performance, data from the balance sheet and profit and loss account of the enterprises for a period of five years were used, available from Bisnode database. The study found that all dimensions of the quality of ERP systems have a positive relationship with selected indicators of financial performance of the enterprises. It should be emphasized that different companies perceive in different ways the quality of the ERP system, because their needs are also different. One company can perceive the same ERP system as high quality and the other not. Implementing an ERP system and adapting it to the enterprise takes a long time and is not something that enterprises can easily change in case they have objections. This doctoral thesis also shows that enterprises should think carefully before choosing a new ERP system, because it is a long-term decision, Also, the vendors of ERP systems should take more care of customer needs, rather than spend resources on developing solutions that are not actually needed by business users.