Which speakers have rear firing speakers and how do they sound?

I have zero experience with that particular speaker but do have some experience with bipolars (I wrote the article kenjit linked to). 

Assuming good execution, I think you can expect rich timbre and a bit more spaciousness than normal.  The sound will be more detached from the speakers than normal; it will sound less like the sound is coming from two boxes.  Also you won't have much in the way of baffle step issues, this because the rear woofer's output wraps around and helps the front woofer right about where the front woofer starts baffle-stepping.  

The upwards angle of the rear facing drivers makes me think they can be placed closer to the wall than most bipole and dipole speakers.  Ime what you don't want is, for the reflection off the wall behind the speakers to arrive too early.  The upwards angle helps to increase the reflection path length by including a bounce off the ceiling.  I do that too sometimes, but not in exactly the same way. 

Duke

I’m curious if you may be referring to speakers that have tuneable rear tweeters?  My Von Schweikert VR 4 JRs have a single rear tweeter per cabinet that has a volume control. I use it for recordings in huge halls to capture more ambience. It works well. A rear firing woofer is often a passive woofer driven off the excursion of the primary woofer. Both can be beneficial if designed properly 

Yes, tunable rear tweeters and or speakers, to give a more live feeling to the music.

The Vandersteen 5a, 7 include a switchable rear firing tweeter w level control for over damped rooms and  recordings lacking much ambient hall / venue information. In this time and phase accurate design, the rear firing tweeter is 100% distortion, but in some cases pleasing.

Isn't this the core issue that people debate

A. Box speakers with front facing speakers are "more accurate - distortion free.

B. Electrostatic, bipolar, open baffle and omni speakers are less accurate with sound coming not only from the front but the back or top - e.g. have distortion built in

But in reality, when you hear live music, there is all sorts of distortion in any hall, though typically the sound is better in say the orchestra at the Beacon in NYC or the Capital in Port Chester than in the balcony. 

So, jump in and tell me how I'm wrong, but my experience is that speakers that are designed to replicate this kind of distortion sound more live. E.g. the Thiel, KEF, Canton and Proac speakers I've owned sound great but less live and less engaging than electrostatics or omni or bipolar designs. 

So, in search of the most live sounding speaker - suggestions?