Well if you are happy that measurements tell the whole story then I guess you would be okay to buy without audition . I prefer to listen and always within my own system so I am sure what I am getting in terms of a sound I like But if there were other issues with noises/thuds I get thats a real problem. I never got the chance to hear the Topping you bought within my own system only the Q DAC and the Rega DAC. I think there might be a sound preference issue that comes into play?
I'm 65 and it's 2022. I've come to except certain things. Devices like amps, preamps, DAC's, streamers, optical drives, should be transparent and flat. I no longer trust manufactures to be largely truthful with their claims, so I look for independent testing.
So far in the past 12 months I've ordered without hearing first:
Allo Boss2 (sold because it clicked when bitrates changed, otherise it was a dandy DAC and streamer)
Topping D30 Pro (love it, completely silent and has enough juice to drive my amps)
Topping A30 pro (love it, drives headphones wonderfully and has pass through so I loose no features)
Sennheiser HD6XXX (not perfect)
SVS Micro 3000 (works better than expected, easy to place and is so small)
Genelec G Fives (these won't arrive until August)
Am I concerned? No. After adding the Topping stuff and replacing my two Beresford DAC's, Linn LP-12, Linn Karik, Linn Wakonda my remaining gear Linn Bi-amp LK140's and Ninka's never sounded as good. Why am I replacing the Linn amps and speakers? I want to downsize. The Genelec's and built in amps, they are biamped internally and I trust they will be uncoloured and flat. From there some room correction,and bass management.
Cheers,
Peter