I understand about the shipping charges, but you could also get an in-home trial of the McIntosh, if you're willing to buy a used unit or a b-stock unit. Audio Classics, located near the McIntosh factory in upstate New York. They offer a 7-day return option, but you will pay round-trip shipping. I bought my McIntosh preamp from them 2-years ago, and the customer service has been outstanding.
Another issue is whether you have tubes anywhere in your system. I am a big tube fan, but dislike the hassle of power tubes. Unless you have glass somewhere else (CD player, DAC, preamp), the tube input stage of the Butler will give you the beauty of tubes without the hassle (and heat) of power tubes.
Just my $0.02