I've tried CallFilter and it was hit/miss with it, same with Callblock. Magicall is superior in virtually every single way. It is highly customizeable and an all around powerful program. Definitely worth the price.
I configured mine to hang up on telemarketers and run xdaShutdown -sleep which puts the device in suspend mode to save on battery life goodness. This feature alone saved me $1700 in saved electricity on my Touch Pro D:
ps- if you have problems w/ telemarketing calls and the legal approach doesn't help, I recommend setting your voicemail greeting to 2 minutes of silence. I always get a chuckle when I get a new message saying "hellloww kewin, are u der?? helloooo i can hear youuu.." I'm not in Kevin