Those speakers may be 7.1 but they aren't nearly as good sounding as the X-540's.
5.1 does destroy a 2.1 yea....but the difference of a 7.1 compared to a 5.1 isn't really that much. Those are cheap budget 7.1 and trust me the X-540's will be better sounding and plenty loud enough.
EDIT: 5.1 means they have there's 5 speakers, while 7.1 means of coarse 7.1.
There is also 2.1 and 3.1 earlier on but not to practical to buy as much.
They both are good but the X-540's even though they are 5.1 will sounds a lot more crisp.
It's Quality over quantity.