For all you asking about relay clicks, as I stated a page back YES the 608 has relay clicks. I have greatly reduced them now though by switching all the audio options to LAST VALID but it still has them on some stuff.
For those wondering about signature required, I bought from ABT and when UPS brought it they put it on the porch, rang the doorbell, and left. No sig required. I do know my UPS man really well but a siqnature was not required nor was it stated it was required anywhere on the package or tracking. I was home when my came so it didn't matter when they brought mine, just make sure someone is home to get it because the box is massive, ABT packed it better than anything I've ever gotten before!
Did some more testing last night and this receiver is awesome. I have to keep turning the volume DOWN! It can go really loud and I think I only have it at halfway on the volume!