I have used SAS since I started selling on Amazon. SAS is a great piece of software and whilst I have used and trialled other pieces of softwares for my Amazon business that have come and gone, SAS is the only piece of software I have consistently used and stuck by. Its clear, precise and an essential piece of kit to analyse potential deals. Reliability is second to none and any issues I have had have been responded to promptly. Price wise I doubt you you will find anything cheaper that does as good a job as this. Excellent value for money.