while I have not used the new version, the older ST-250 is a pretty intense mic. Once you get to know its "ways", you can pretty much always pull a great recording w/one.
lots of dough though.
My site has 2/4 channel surround HRTF type mic array models that
always record surround ambient exactly as heard.
While 4 channel DSM array needs no decoding into 5.1 format, just simple editing to extract LFE and generate CTR channel, it is a relatively
expensive system.

On the other hand, the 2-channel HRTF DSM mic array is low cost, has
naturally encoded surround information
inside the stereo channels, and needs simple
decoding to extract 4 or full 5.1 channels
So far, only hardware decoders easily found like Dolby Pro Logic II, DTS NEO-6, and some ambisonics/circle sound type decoders more-or-less work to extract 2-channel to 4 or full 5.1. You can download sample recordings, trying various decoders yourself with recordings on two pages starting at
www.sonicstudios.com/mp3.htm Special post of higher quality .ogg 16bit/88.2K and master quality 24/88.2K file versions of TRITTICO perfect for DVD-audio decoder trials at:
www.sonicstudios.com/mp3_2slp.htm#afbotwHowever, software decoders for directly extracting the 2-channel HRTF stereo to 5.1
surround wav or DTS/AC3 files formats is also a possibility with methods/programs at special discussion site requiring easy membership
http://www.dtsac3.com/cgi-bin/yabb/YaBB.plMaybe look into the links provided for background helping hardware/software/gear choices.