Those stacks are not very thick compared to existing units ... would not be surprised at all if the total mass is the same as existing coolers, and dimensions not that much different either. Design seems to be all about getting an extra fan in there but yet most and 2 fan cooler can mount a 3rd fan. This could have a fourth.
The weight of these coolers is a non-issue except during shipping if not properly supported. The 60 - 70 pounds of clamping force applied to get optimal TIM heat transfer dwarfs any impact of the weight on the MoBo.
Retention brackets have been apart of 3rd party cooling since the getgo and, again, it has as more to do with "clamping force" which is 30 times the unit weight. Pushing a CPU "hard" does not increase the weight or forces on the board.
The comment an RAM selection took me by surprise. The need for tall heat sinks disappeared with DDR2, and now the only function of these tall toothy designs is to "look cool" in the package. You cant see the profile or the fancy graphics once installed.
And yes, it does look like a Phanteks clone, even adopting Phanteks color choices.