MBL Speaker Placement + 116F

I am interested in getting the MBL 116F was wondering if you could share your experience. How do they sound compared to other similar priced speakers? I Read a review regarding the previous model and the reviewer noted that speaker placement is very critical. However, I am not sure what he meant by that. Your suggestions are much appreciated. My room is 13' x 20' with an opening to the dining room.

Thanks very much,