I had a pair of AGD’s in my system and will say they sounded good for the money. There was a bit of lack of refinement on the top end… if I remember correctly. But then I was comparing them to Audio Research Reference 160 mono blocks. I also only listened to them for an hour or so.
Just curious, which specific AGD amp(s) did you audition? Also, which preamp was used during this time? IMO, the synergy between class D amps and preamps is probably even more important than regular class A/B component matching.
Also, one hour is really not sufficient to form an opinion about any audio gear. There have been times when I absolutely hated a piece of equipment in the first few hours, or even days, only to change my mind after further listening.