From the literature I have read, ATI builds their own PS where Buckeye and VTV just assemble parts into a case. ATI's 7 year warranty is near unheard of and Morris Kessler has been designing amps for decades. I looked at Buckeye and for the money, they seem okay. However, not sure what support you get from Dylan after their 2 year warranty runs out. I know on some Monoprice amps (ATI builds), they replaced the toroidal at near the 5 year mark. I'm also not that into paying someone to put "stuff in a box" that I could do for less. For me, it's not worth the risk and I'll go with a proven company with decades of experience. If I pair ATI with Arendal, that's nearly 10 years of worry free performance from my gear. I will gladly pay for that comfort. But thanks though!