There's always something to look forward to with every new heatsink from Xigmatek. The tower-style heatsink design is not new, but Xigmatek innovates with each new cooler. Xigmatek Aegir introduced the Double-Layer Heatpipe Direct Touch (DL-HDT) design. While to what extant exactly this benefited cooling performance will require a more deep study, but one thing is for sure: Aegir delivers high cooling performance even without using a fancy fin design that makes use of dimples or ridges. Another contributor to this of course is the fairly even distribution of heatpipes across the surface of the fins.
The Xigmatek Aegir fumbles a little in area of pricing. At close to $80, it is a little on the pricey side. If we recall correctly, Xigmatek started off as a company that rolled out bang-for-buck alternatives for Thermalright coolers, and then on picked up with the success of its HDT design. A more softer price for the Aegir would have gone a long way in competing with even entry-level water-cooling solutions that are priced around $80~90 and offer performance that's comparable to high-end air coolers. Overall, the Aegir lives up to the reputation Xigmatek earned over the years. Go for it if you want a sensible (and relatively safe) alternative to cheap water-coolers.