I remember that software, but it was pay-for so I just ignored it before. Currently however they're allowing you to download for free until Dec. 31, so I gave it a whirl.
To be honest I've no idea why people are hating on it, because I actually like its results better than Dolby Headphone! Not only does it work for 7.1 surround, but since it works as an actual sound driver it works for any surround audio source. Also if you turn off all the post-processing stuff, the audio quality sounds much less butchered than what Dolby Headphone does - this is particularly useful for stereo audio sources.
For anyone that cares, I'm using the ever-so-famous (white 9963) "Enhanced Bass" Monoprice IEMs. These IEMs are quite well-known for their wide sound-stage, so in the Razer Configurator I had to actually manually reduce the sound-stage. For headphones I selected "Hammerhead Pro", and for calibration I moved the front left & right 5 clicks from being as forward as possible while moving the rear left & right back by 5 clicks.
EDIT: Ah, I think I know why people are hating. I just did a waveform recording and comparison between Razer Surround with it on and with it off and used a non-loudness war-victim stereo song (Clannad visual novel actually >_>) as a guinea pig. It turns out that Razer Surround seems to boost the treble, and I know that head-fi definitely has its share of bass-heads. Personally I'm not a bass-head at all, so I didn't really notice nor care all that much. It may also be because the Monoprice IEMs are known to roll off the highs a bit, so boosting the trebles some may actually help.
EDIT 2: From some testing it would seem that enabling Razer Surround's 'Stereo Enhancement' also helps reign-in the treble-boost somewhat, so if you're "allergic" to treble then that may be relevant. However I think it also reduces the bass a little bit as well, though not as much as the treble.
EDIT 3: For whatever crazy reason whenever a song stops playing in Foobar, Razer Surround's CPU utalize skyrockets for a couple seconds to the point of making my PC hang for those few seconds. This does not happen if a song is set to loop unless I hit the stop button manually or I actually close Foobar completely, and then said CPU spiking will occur.
Edited by Nintendo Maniac - 12/15/13 at 6:14pm