There is absolutely nothing wrong with SpyZooka, it works just fine, and how much better than 100% spyware removal guarantee do you want?
You can argue until the cows come home about the merits of free programs, and other anti-spyware programs .. and it's the equivalent of starting a Ford/vs/GM argument, or a Boeing/vs/Airbus argument.
Each have their merits .. I paid my $$ and have an antispyware system that works .. and works well .. is regularly updated .. and which comes with a guarantee.
I note that the argument thread that Tarq57 linked, merely rages around a dubious advertising method, used by a SpyZooka affiliate .. and no-one has questioned SpyZookas ability or guarantee.
If we refused to buy a product because the company we wished to buy from, involved itself in some less-than-precisely-honest advertising .. we wouldn't be buying very much in this world ..
