Depending on your home/office construction and layout, you may see full speed for many meters with a normal 802.11g access point-I do. But MIMI does help in providing better signals a bit farther out. Of course people said that about "G" wireless when it first came out too. And MIMI MAY help with interference, depending on what the source is. Basically, if the interference is limited to a narrow band of frequencies then MIMO will help (as will changing your access point's channel), but if it's broadband interference (old microwave ovens, for example) then nothing will help.