Looks good for the money

Right, a few little pointers.
Here is the real info for the power:
Front/Surround: 40 W per channel, RMS at 3 [ch937] at 1 kHz, with 10 % total harmonic distortion.
Center: 100 W, RMS at 4 [ch937] at 1 kHz, with 10 % total harmonic distortion.
Subwoofer: 100 W, RMS at 4 [ch937] at 30 Hz, with 10 % total harmonic distortion.
Biggest concern is the THD (total harmonic distortion), its MEGA high when driven hard so dont go running it flat out to much or you could risk damaging the high range drivers (just noticed, the speakers dont have any!).
Also, the total power output in the JVC site states 320W max....not RMS so the RMS figure is likely to be considerably lower (maybe even less than half).
In addition, the unit is not big enough to have a 500VA transformer (unless it is a switched mode which might help explain the bloody awful THD figures!) in it so as much as each channel might be able to drive reasonable wattage alone, the PSU will not be able to supply enough oommph all 6 to work at high outputs simultaneously. The spec states 60W power consumption so that also does not tie in with the magic 320W!
Most importantly though, play with the system, adjust the speaker levels well, move the speakers about a bit and get it to your taste and you will wonder how you ever lived without surround sound!