The other reviewer here speaks to the point "if you're already here, you have an idea what Darkspace is like." I concur. Darkspace is so far beyond any other band 99.9% of the public has ever heard of, it isn't even funny. Let's talk about why.
The music of Darkspace centralizes on painting one picture: portraying the vast emptiness of space.
Read that until it sinks in.
Darkspace's albums are simply titled I, II, and III, and the songs are simply 1.1, 1.2, etc. for the songs on the first album, 2.8, 2.9, and 2.10 for the songs on the second album, then 3.11, 3.12, etc. for the third album. Lyrics are about as hard to find anywhere as that of Gorgoroth.
I have listened to this album about 4-5 times since first getting it about a year ago. Up until my most recent listen, I came away with a headache every single time (and this is coming from someone who had already been listening to Moonblood, Vlad Tepes, Behemoth's demos, etc.). Darkspace's production isn't "raw" or "muffled" to the point of being unlistenable like Moonblood etc., but rather Darkspace DOES something to their sound to make it sound distant and truly accomplish its apparent goal of making you feel like you are floating in the void of space. From that alone, it would be fair to say that Darkspace is perhaps the single most atmospheric band I have EVER heard. (Don't make me run off a list of the obscure bands I've stumbled across. And I did say "perhaps.")
On that same note, Darkspace needs to be heard to be believed. Then again, unless you have been prepared for Darkspace through countless other black metal bands, Darkspace will go right over your head. The closest comparison to Darkspace I can come up with is some of the Swedish black metal with long songs, namely Dawn on the Slaughtersun album. That album doesn't have an atmosphere that even fits in the same ballpark as Dawn, but that is the only other album I know where the band will time (or track) and time (or track) again deliver relentless assaults from all instruments. That's what Darkspace does.
"Repetition with expansion" - that's the phrase I would coin to describe how Darkspace's sound "works." 2.8 and 2.10 both start with a simple, base structure. And it doesn't waver. But rather, more and more and more keeps getting layered on top of it. Where most bands would either end the song at the point or shift it (ex. beginning of "Part II"), that base structure stands firm like a tower during a wild storm with driving winds and pelting rain. That wind and rain adds to the sound that was already there. And yes - this is when I, the listener, realize I can be no place else but the vast emptiness in space. Drums are furious blastbeats about 70% of the time this is going on (ala Legacy of Evil-era Limbonic Art (2007)) while at least one guitar is playing tremolo. Sometimes, one of the two guitars is playing a haunting lead riff that sounds like it was taken from one of the sound effects used in the instrumental.
I can't go further without discussing the middle of the three tracks here, 2.9. It is 10:23 of ambience, mostly movie sound effects. Not one metal instrument is heard. There is oddly a sort of rhythm here that makes the passage of the 10:23 go by fairly quickly and actually creates a sense of build-up/anticipation. It is more easily endured than many 3- or 4-minute ambient tracks I could name.
Tracks 1 (23:41) and 3 (20:10) are full-on black metal songs supported by sounds similar to those heard in the instrumental. I prefer 2.10 over 2.8, but that's just me. Any of the three tracks would make a great soundtrack while reading 2001: A Space Odyssey or any one of those sci-fi classics from the 60's or 70's.
I've pretty much neared the end of what I have to say about Darkspace. Let me just throw in some other things I know.
Darkspace is not the first band of the songwriter. Wroth (guitars and vocals) was also the solo member of Paysage d'Hiver (there called Wintherr) - a band with 10 demos (to date) to their name averaging about 45 minutes (although going up to 92:56) in length. It is a very similar project - ambient black metal with the bulk of their songs over ten minutes in length and three over 24:00. I've also seen videos of Darkspace live. Oh my goodness. Unreal. I just barely passed up an opportunity to see them live at a festival in Canada in 2012. If it wasn't Thanksgiving weekend, I probably would have done it just to see Darkspace.
I usually close my reviews with something to the effect of, "If you love this, this, and this, then you've got to hear THIS!" I can't do that here. Darkspace is sure to scare away many. I can only wish that you'll love this. But it even took me 4-5 listens to come to terms with it rather than just shrug it off. Patience. Preparation and patience. When you're ready, come to Darkspace. Just be warned - you may have a hard time going back to "ordinary" black metal.