I have listened to some of the other ANK amps and they sounded fantastic! The best thing about the ANK gear is that you can purchase upgraded parts to install instead of the stock parts.
I have owned the ANK M3 (L3) preamp and the ANK 2.1b DAc in the past and had to sell them for a financial need.
There isn't a time that I lament that decision

and would love to rebuild a set one day.
If you can, I say go for it!
Remember that good NOS el84 tubes are tough to come by and the provided stock tubes are average at best.
The cost to performance ratio is off the charts with the ANK gear.
Chris