Has anyone heard System Audio Mantra Speakers?

I was interested in System Audio Mantra Speakers, probably the Mantra 5 or Mantra 10 bookshelf speakers, or the Mantra 50 Floorstander speaker. There are only a couple of retailers in the USA and they are out of state from me. There are also no reviews on System Audio, though I've heard they are really musical and an incredible value. Not sure how they compare against other speakers. Has anyone heard them or own them? Which model? What did you like about them? I listen to all kinds of genres, but mostly jazz, pop/rock, and some classical. My current system is a Primaluna Dialogue HP Integrated Tube Amp, VPI Prime turntable, and Ortofon Black Quintent cartridge. I expect to add a Herron Audio Phono Stage at some point in the near future as well. Thanks for the advice!
I heard several models at Wilson Audio in Metarie, LA and was very favorably impressed. I heard the small floorstanders with a Rogue Cronus Magnum and thought it was really good sound. I would compare them to Dynaudio.
I live in New Orleans and have owned their entry level SA505 (discounted). I currently own the Mantra 10s which are the lowest in own Mantra line (a large bookself)

Good Qualities: Overall very balanced speaker. Very smooth a tad bit of warmth and "bloom". Still not far away from natural. Very natural. Excels at jazz, small to medium scale acoustic music and piano. Overall musical speaker. Most things sound good.

Weakness: Bass. The bass these speakers do produce is enjoyable and realistic but they don't go low. If you a bass head these are not for you. More about resolution paired with musicality.

The inability to do low bass is not a killer but on some tracks of bass heavy music the bass does not stack up well. but its the minority of songs in my collect. The speakers do intergrade the bass they do have well with most music.

Obvious with out the bass you lose impact on recordings and maybe classical and large scales work are not what the could be with more bass.

They other weakness is that some electronic music or heavy distortion or filters can sound bad. Its really a crap shoot because it handles some music with that well and other it just does not do well. It might actually just be a the recording quality as opposed to the speaker.

Overall I am very happy and have thought about moving up the line. While not huge on bass if I start looking at 5-6k I want it.

I have not heard the 50s but just heard there Ranger Series 6k paired with expensive Audio Research tube amplification. I really like the speakers. I need to hear more and personnel don't thing Audio Research is a good performance/cost ratio. I would have liked to hear them with something like Ayre electronics or something more resolving with the Ranges to see how they do. Also I would like to turn it up more to see if I would be satisfied with the bass output.

Heard System Audio with NAD, Audio Research and Exposure.

I run mine with a VPI Scout and Dynavector 10X5. Very happy.
Thanks for all the help. Darkstar1, were your comments about the problems with the bass exclusive to the Mantra 10's or across the entire line? I was wondering if the Mantra 50's would provide enough bass. While not a bass heavy listener, I would like to have a full sound consistent with the recordings. I guess one could always supplement the speakers with a subwoofer?
Honestly when you are looking at speakers the size of 5 and 10 you are not going to get deep bass. Generally speaking smaller speakers don't have low bass.

For the size and money of the 50 you can find something with more bass. Will it be as good or better is a question only you can answer.

If you go with a bookself I would not hesitate going with system audio. They do compare well with bigger and higher priced names. If I was getting bigger speakers I would ask my self if I need more bass in a speaker that cost that much.