Call Blocker/Rejector

Anyone have any real suggestions for a good call blocker? I'll gladly pay for one that actually works. I am having a tough time making any determinations based on reviews in the app market, one says its great, the next says its awful. I will keep trying and adding to my list until I find one that works. Suggestions welcome!

HTC evo shift, gingerbread

Tried:

Extreme Call Blocker(Trial version)- Failed. First call of only number in blackbook rang through, was able to leave voicemail and shut pandora down. Does paid version work? Uninstalled

Mr. Number- let blocked numbers ring at least twice, and any time I touched the screen, would cause the phone to redial the last call made, even when it was still locked, terrible. Uninstalled.

Advanced Call Blocker (wahooka- paid)- Simply did not work, allowed numbers in black list to go through. Uninstalled, money refunded.

Now trying Droid Blocker, shouldn't be long before the collector calls my deadbeat ass.....