The Mugen is 158mm tall same as the 212+.
They are both excellent coolers the Mugen will be quieter then the 212+ and is actually a bit better cooling wise.
However it's alot bigger then the 212+ and can be a pita to install since it's wide.
130mm wide as opposed to the 212+ which is 120mm wide.
This can cause problems with dimm interference and depending on the height of your ram can be a problem.
For $10 cheaper the 212+ will be an easier install and less likely to have clearance issues.http://www.scythe-usa.com/product/cpu/040/scmg2000_detail.html