Definition: In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.
Input: I am a heavy computer user for past 30 years. You will find out why it's so cheap. I really do not understand how come the user review of this mouse is so excellent? There is also time lag in response especially when the screen is in sleep mode. Not good for the beginner. ================ I am much happy with "Logitech M510 Wireless Computer Mouse – Comfortable Shape with USB Unifying Receiver, with Back/Forward Buttons and Side-to-Side Scrolling, Dark Gray", in terms of mouse quality, accuracy and all others.

You will find out why it's so cheap. Do not understand user review is so excellent?