The following graph shows the NAS server's total performance rating, comparing it to other units. The comparison is pretty straightforward as the tested unit is shown as 100% and every other unit is relative to it. Please note that I only measure the raw performance in the graph below, not each unit's functionality and available feature set.
Most of you will find the following graph the most interesting as it shows you how much the performance of the NAS will set you back. I looked the current USD price of each NAS up on Newegg and used it and all relative performance numbers to calculate the performance-per-dollar index. I search for the unit at other popular online shops (e.g., Amazon) if Newegg doesn't have the NAS in stock, and, if the unit is not sold in the U.S., I search popular EU shops (e.g., Caseking), converting the price to US dollars.