Tried a
Labgruppen IPD2400 earlier this year to drive the 18" subwoofers in my open-baffle setup. Decided to get that one after lots of reading reviews and marketing hype. What a nightmare that was. The amp was so noisy, where ever I placed it, it was just plain unusable. Built quality etc. was certainly not comparable to any of the 70s or 80s amps I used so far.
I was lucky that there was a problem with the display, so I returned it for a full refund. Then got very lucky and found an Accuphase P-550 for a song due to some very slight cosmetic imperfections. No problems whatsoever, and just mean fat bass all day long
I won't write off Class-D entirely, 'still curious to compare it with other A/B amps, but I would certainly not buy one without a solid return policy.