A:  I have used the first version with Poser and it does export in BVH for sure.  it has been a while since I have used it but if you follow the videos they have it should work with no problems.

 

B: I have been able to get good results most of the time.  However make sure you have good lighting and not too many shadows as that can cause issues.  I had one spot in the studio where the lighting was not the best and would end up with one of the legs jumping because the software would choice the wrong leg and mistrack.  There are options in the software to reduce some of these problems.

 

C:  I have 6 of the PS Eyes and two Kinects and have been able to get better results with the PS Eyes.  Although that maybe due to version that I am currently using.  The issue I ran into with the Kinects was the reflects in the room would cause the depth to change.  This may have been due to the black curtains hung around the room as we were using it as a temporary TV studio and the curtains may have the wrong type of IR properties.  Have not had the time since we moved back into our proper studio to do more tests as it is being used for the students projects.

 

D:  You really need to have active USB extension cables as you need to have all the equipment out of sight of the computer that is doing the capture.  Also you need to have a blocking screen to hide behind as the calibration is taking place because the software does a look at the scene and removes items that are in view.  So if you have a chair it will be removed when it does the calculations on the movement,  but it is best to have as clear an area as possible, because each object will block that much more of the possible tracking area.  As far as the computer you need to have a very fast write speed to the hard drive.  I have two SSD's in a raid 0 configuration.  Also you will need a video card with as many cores as possible.  The software records the motion from your Kinects or PS Eyes and uses the Video Card to process the vector data to make the motion, so the faster your video card the faster you will get the final result.

 

Having said all of that you really need to look at what you will be doing with the system.  I bought my copy back several years ago when Content Paradise had a 50% off sale.  With their current pricing I would want to ensure that I have all my shots lined up and ready to go to justify the cost of the software for the hardware I have.  If you go with the lowest cost option it uses a single Kinect and for that I would just get Poser 2014GD version and have the live feedback in Poser.  however the higher end versions do work (at least in the version of the software I have) and it does have a trial version so you can see how the processing works

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13