I've never had the opportunity to play with one these decks so I could get a feel for the SQ and build quality but the specs on them seem to be competitive with most decks out there in its price range.
those are max powers ... the 9700U has a max of 60Wx4 (23Wx4 RMS) and the 9800U has a max of 70Wx4 (25Wx4 RMS) or something close to those on the RMS ... but these are still much higher than the average 18Wx4 RMS of other decks