I actually prefer the NAOS 5000 myself (what I'm using) because of the adjustable weight systems. Not that I need adjustable weights per se (they were a fad I never understood), but I enjoyed that I could make it a heavier mouse. I like my keyboard and mice to have a nice heft to them and most mice just don't have that normally.
KailecI would say that is the exact point of an adjustable weight. My roommate and I both had R.A.T. 7s for a while. I made my mouse significantly heavier than his. Similar to adjustable DPI. For me the reason I get it is because I have a DPI that I'm used to and when I get a new mouse I like being able to match that as best as possible.