at least three other people have told me "the brand sounds weird". yeah i've never heard of anker either until now but the reviews say it's pretty quality. as far as buttons go i just rebind them to everyday uses, i.e. browser back/forward, next turn button, etc.
with my new keyboard and mouse together i may be looking into macros if i need to get that serious but for the time being i just like the customization features
It's worth noting that mouse 4 and 5 are default back/forward in pretty much every browser, so even intellimouse explorers (If you don't care about flashy stuff, that's a great mouse btw. pretty cheap too, also look into the MS Mouse 6000 as it looks like that's replacing the intellimouse explorer) support that.
Don't be buying a mouse for what you might do in the future, no sense wasting money on that. My g500 that recently died had a mouse6 button that could only really do macros and forwarded keys, I never ended up using it, same with the 5 macro keys on my keyboard, no matter how much I tried to think of a use for them. Chances are if you can't think of a use right now, you will never find a use for them.