TesseracT's website says that the initial idea was to "Create heavy music that moves you; embraces and enhances you; giving you what you think you want and then taking you somewhere totally unexpected, like a journey or an adventure", and this is exactly what you get, something pure and simple yet so deep and heavy theres no limit as to how to describe it.
Although this demo only has 3 songs totalling up at 19 minutes its enough to show you how good and how unique TesseracT are. The second track (For all you Fredrik Thordendal fans out there) opens with what is uncannily like Special Defects and then morphs into it's own realm of musical features.
Take the Symphony X front man (Russel Allen) and put him with Meshuggah/Fredrik Thordendal's Special Defects and you get an idea what TesseracT sound like.