The 3.7i is the sweet spot in the Maggie line up, the best value. If you are a Maggie lover with the right amp, I guarantee you will not be disappointed. Examples of amps that make them shimmer are the Bricasti Design M25, The Parasound JC 5, and the Pass X250.8.
The speakers should be in symmetrical corners 3 feet off the front wall and at least 1 foot off the side wall aimed directly at the listening position. The wall behind the speaker needs to be deadened with 6 or 8 inch thick acoustic foam tile floor to ceiling to limit comb filtering and provide the best image specificity.