Mapman,
I'm not about to get into debates but I owned the the MBL 6010D pre-amp at the same time I owned the ARC REF3, both are gone and replaced by the VAC Sig. MK2a and I have never looked back.
At the same time I owned the mentioned pre's above I had the 9008 mono's and 9011's mono's and no way do they come close in over all comparison to the 450's other wise one or the other would still be in my set-up.
In relation to MBL product my two favourite pces are the 101E speakers and 1621a transport.
Discussions are great but in the end I have owned and lived with my gear for a long time and they are dialed in so I'm writing my thought's from first hand exsperience not going to showrooms and or shows and listening, big difference.
I agree with you that there are allot of things going on but this is with any set-up but I will say I finaly have found amps that just do it for me and it's a great feeling but then again it's just not the amps but paired up with the VAC pre I currently have.
I'm really looking forward to getting them.