I'm not endorsing nor condeming the D'Amore Class D amps. HOWEVER, there are A LOT of other things that will affect the FINAL SQ of ANY particular system MUCH more significantly than the amplifiers that were chosen!
The Quality of the Speakers & Subs along with the quality of their INSTALLATION, along with the Quality of the system setup and DSP TUNING will all have an EXPONENTIALLY greater affect on the SQ compared to what Amplifiers are being used!
IMO&E, as long as they provide enough clean and unclipped power to all of the speakers and subs in the system, Amplifiers are the last piece in the puzzle that should be swapped and upgraded.
With that said, I still think that these amplifiers are a good deal, especially at their currently discounted prices. As a respected amplifier designer and engineer, I highly doubt that Tony would choose to put his name on and sell ANY amplifier that he deemed to be a bad design with subpar performance.
Right now the E350.2 and E750.1 are both on sale with an Extra 10% OFF which makes them each less than HALF their normal retail price...resulting in a low price of just $109 and $129 respectively.
For someone starting an entry-level budget SQ system, I think that these would be a more than decent choice, and you could definitely do a lot worse.