Yes it is. Its a monster.
I never truly loved the straight up tone from any amp. I always stack it with another preamp.
Currently using the sansamp dp3x and light od from the forte and the tone is amazing.
Its thick, deep and gets louder and more focused than any of the class d amps I've tried, all 3 mesa subways, dg aou900 and gk legacy 1200.
Its not a cheap amp but there is a reason it costs what it costs and to me its worth it.
I havent gigged the four10's with it yet but my revsound 210/215 stack sounded great.
My lineup is my spector euro 5 with nordstrand 3 band eq and big split soapbars, dp3x, aguilar tlc comp into the amp