Daczilla just arrived tonight. If you want something that can dwarf a Topping A90 I have good news for you!
I currently have a Topping D90, D90SE and LE plus a Topping E50 and D30Pro out on the tables. Some initial thoughts:
It's huge.
The vivid and gentle settings are a little more effective than the SMSL M300/M500 type "color" settings but pretty similar. It won't keep you from equalizing though. If you have the DT990 600ohm with it's treble spike, no amount of clicking "gentle" will save you when it hits that frequency.
This has the A revision, so I tried using a decibel meter and it didn't increase volume when going to vivid, so I don't think the voltage increases in that mode like was mentioned a while ago. Just had to try it since I've got the A90 amp and phone here to test anyway.
If you have a rack system and the dimension fits, it's a good reason to get one. In a large home it could scale up to big furniture and decor.
The Topping E50 I was using on this A90 all day sounds no different. With vivid then it's a little brighter/lighter sounding, but very song dependent if you'll notice it.
You don't need the remote to use it, standard 3 prong power cord.
Laser thermometer reads 99F on top and sides after running it for an hour with nothing sitting on it.
Just had an X18 last week and it sounds the same. I use a $14 Febsmart 2 port USB card, and everything sounds great on it (located on the heavily shielded side of the power supply away from everything in a mid tower case).
I sell equipment, so don't have to rationalize a purchase since I don't keep anything. It's an aesthetic and connectivity decision for someone. For a professional rack or home person with a big listening room and wants it to fit in.
I'm going to start a game now, so I can tell people I play Destiny 2 with a $1200 DAC