Lumin U1 vs Lumin U1 mini + sbooster?

A T2 sounds good but it’s dac is not even close to say a Denafrips terminator, or Holo springs kre May dac ,that can be plugged in 
at a later date ,my friend has the terminator it destroys the inner dac in theT2

Mike at Audio Arcon does the Sbooster upgrade and doesnot void the warrant 
You get discount on the Lumin ,not the booster and maybe a $50:charge.
I prefer a Good external dac much much better  .