Cords aside,
I had an AVA (Omegastar) pre-amp for about ten years. Then I upgraded to Insight (not Insight+, so I dont have the most recent model). I have not listened to Krell or other models, in part because I dont need to. I was extremely happy with my old AVA unit, but am amazed at the new Insight circuitry. The 30 day guarantee is a no brainer. If you live with the AVA unit for a couple of days, I'll bet a buffalo nickel it stays with you.
Oh yes, and you never have to worry about the power cord coming loose.

Cheers,
Mark