I had had , yeah what a casualty, nc252mp stereo built from audiophonics, it's more reliable because is hypex, real discreet, more powerful but not as detailed and high resolution as b100 but much more reliable. I sold mine because I'm addicted to detail and it was not enough for me, is like hypex UCD, works great but not enough transparent, perhaps thd not enough low. But at least it won't blew in months. Perhaps it was the fault of my ex Tannoy mercury too basic. Perhaps is great with your better Kef. You will be confident it is more durable and work better with tougher load. Topping is good for DAC, I have DAC E50 and it's amazing good. That's all . For preamps and power amp choose other. I'm curious about B200 though...too expensive for also minimum 4 Ohm impedance also as B100, meanwhile happy with 3E Audio PFFB amp making dance some jazz from youtube music with my Triangle Borea 07 right now very low volume in Madrid , Europe