ChessMarkstheSpot: I bought Fritz12 recently too. I had experimented with Aquarium and Rybka4 previously - Fritz12 is MUCH better IMO. I've played 100 or so rated games and love it. I'm slowly starting to improve.
Fritz12, Chess Mentor and Tactics Trainer are my main tools
I don't know if this is the right place for this topic but if not, I am sorry mods. Be gentle with me.
On August 13th, I finally got Fritz 12 as a surprise gift from my girlfriend. And from then on to now, I have played 50 games so far. I usually play "series" type matches in Friend Mode, 5 game Series, 7 Game Series, you get the idea. My handicap was pretty high as I was humbled by the program and upset by my own dimwitted blunders. Since my handicap has gone down about 200 pts in the span of the last 4-5 days, I wanted to share my thoughts on this program.
I go over all the analysis and play positions out on one of my many chess sets and see where I've did right and where I have gone wrong. Lately, my play has drastically improved to the point where my matches take longer, my patience is greater, even though for the past 5 days I have been suffering from a very bad sinus infection and feel very sick most of the day. F-12 has made me a better chess player, moreso then what the CM series has done for me. I don't feel confident enough yet to start playing Live on here, but it has definitely helped my board vision and thinking ahead 5-6 moves. My ongoing record is stored on my profile here and I record every game as soon as it ends. To anyone who is thinking of buying this program, no matter what skill level you are, you will see an improvement in your overall game. I certainly have.