I have a V9 and have found it to work great. with the fan speed set to low it's quiet and and effective certainly effective.
what does help I must admit is that I lapped the HS. I'd never lapped a HS before this one and whilst I didn't think lit would present much of a challenge, I must admit that I was a surprised just
how easy it was. the copper slugs in V9's must be fairly of a very purity as it's very soft.
since this was a HSF I've never used before I can't make a comparison with how effective my lapping effort was. what I do know is that previously my CPU ran 65C @1875MHz on full load using a Black Thermoengine HS and Sunon 5500rpm 60mm fan which in itself is a decent combo, this new lapped V9 and with 80mm SmartFan running @ 3600rpm runs keeps my CPU 12C cooler under the same speed and load.
pictured below is my 1st ever effort at lapping a HSF:
it took me all of 20mins to do. 10mins lapping with 600 wet'n'dry, 5mins polishing with Autosol Metal Polish and 5mins removing all residue with an acetone-free alcohol based solvent. for the paper, I used an aluminium-oxide wet'n'dry paper (kindly borrowed form slo crostic). aluminium-oxide wet'n'dry is designed for two-pack paints instead of the more common, and cheaper, silicon-oxide papers (gray-black). it's my belief that aluminium-oxide paper is better suited to lapping as the grit is more uniformly placed on the paper when compared to silicon-oxide papers. in the case of lapping, even sanding is of the utmost importance and aluminium-oxide paper will sand metal that little bit more evenly.