I finally purchased the 5 open from a Tri-art dealer. I have wanted a pair for a few years and I was letting the price stand in the way, I was seeing others who have open baffles for slightly less. Every time I heard them I would just be struck with that feeling that I haven't heard much better sound ever.
I visited their facility located in Kingston Ontario last fall after the Toronto Audiofest and had a look at their facility and how they are made. The owner Steve took us around and gave us a tour and I was impressed with the details they take into consideration when they make their products. He also showed us a glimpse of what they might have coming in the future, with the possibility of manufacturing their own drivers.
I now own the 5 Open speakers with their amplifier and passive preamp as a combo, and moved out the magnepan 1.7i and Accuphase class A amp and preamp. I still consider them my reference but slowly and surely my ears can hear a difference in dynamics, I can hear more music and detail , especially bass! Bass instruments and the lower frequency range of say 40-450 hz. is so beautiful to hear on these speakers with the room dialed in with the adjustable crossover. You can add in as little or as much of the brightness from higher frequencies and your ears want or can stand. :) details are there and after hours and hours of comparison with two sets of ears we both agreed that while on some tracks the maggies were still king, overall the 5 open speakers were so much more fun and dynamic and having 4 huge drivers in the room gives them so much presence that the maggies do not.
I almost bought the 4 open to save a few bucks but glad I finally pulled the trigger. totally happy and totally recommend to anyone , take a pair home and see if you could want to give them back :)