A survey from Walker Information shows IT products don't offer enough value, yet many buyers feel stuck with vendors.Feeling joined at the hip to your IT vendors? You\u2019re not alone.According to market research firm\u00a0Walker Information, half of 2,259 IT executives surveyed are unhappy or less than pleased with their IT vendors. However, many say cost and deployment barriers make it difficult to switch to another provider.\u201cPeople stay because the cost of exit is too high,\u201d says Marc Drizin, vice president and loyalty specialist at Walker. \u201cThree out of four people will buy again, and of that 75%, two-thirds want to and one-third have to.\u201dThe study measured customers\u2019 attitudes and experiences with hardware and software vendors, including\u00a03Com,\u00a0Cisco,\u00a0IBM,\u00a0Microsoft,\u00a0Oracle,\u00a0Seagate\u00a0and\u00a0Sun. Results show that 54% of respondents see the value offered by companies as \u201cexcellent\u201d or \u201cvery good.\u201dNetwork equipment merits the highest rating for overall quality. However, IT executives say purchases of infrastructure software, such as network management or security, and enterprise applications lock them in more than network hardware, server or storage systems.Likewise, the larger the company, the more likely it is to maintain its IT investments by remaining loyal to a particular vendor.