Hi Bill,
Well, this is going to sound like ad copy for your Bella Extreme 100, but that is not my intention. I received the "BE 100s" in early November and they also took about 300 hours to settle in. After that period, there was a startling amount of low level detail and resolution. Some call this "tonal saturation". Whatever you call it, the same character is present in the ModWright preamp.
This resolution is not due to a hyped upper midrange, though. On the contrary, the forwardness/grain that is present in almost every new component (that some listeners find appealing on first listen) dissipates and the mids/treble become more relaxed and LESS forward. For me, this means greater long term satisfaction and less auditory fatigue with long (>3 hours) listening sessions.
There seems to be a very positive synergy between the two components since both "energize the air" with often startling degrees of micro-dynamic information.
Regards,
JerryS