Videos - the main ones I can think of are on the GOG website there are a number of comparisons between H & A RBs and AVRs, I think there could even be one with an outstanding genuine OEC an AVR and an RB.
I think real life photos can be very helpful, too. Every time I look at my own avatar picture, I think how much I love my diamond over the mrb's that I have had (even though mrb's are beautiful, too)!
Thanks ya'll. Panda is right--- I'm trying to look for things to show BIL. We're considering a transitional OEC (not like the AVR unfortunately, so that's a bad comp) vs. a MRB.
I appreciate all the contributions I wish I was a MRB girl cus I sure as hell don't have a MRB to compare!