Alright, I figure its time I give a a little review of my falcon experience
The games I have played it with: HL2, L4D, TF2, and BF2. (I have been to busy in college to try Css)
HL2-
WOW. I have never had more fun playing a game before. This takes Half life and adds so much fun to the game play. I tried to play without the falcon after my first run though and it just was not the same. The feeling you get when you use your weapons is amazing. I was able to feel the different weight of objects when I used the gravity gun and could the recoil, well the recoil was simply superb. I was EXTREMELY impressed with the impressiveness the falcon provides to the game compared to a mouse. As far as the controls of it, I have not played HL2 in a while before I got the falcon so my familiarity with the weapons was about the same.(for mouse vs. falcon) I did much better using the falcon. Being able to sense where the damage comes from and using a pistol grip to actually aim makes for a much more fluid reflex.
TF2-
TF2 is a game that the falcon was meant for. For lack of a better term, the game has guns with sloppy handling, where aiming is more of a motion, but also can quickly switch to a game that requires absolute precision. (pryo and sniper) The falcon has the control and the flexibility to do both of these. Sniping with the falcon is much easier than with a mouse. The controls for other classes were also much easier to control. Using a heavy and a pyro was much easier with the falcon. Being able to sense where I was being attacked from allowed me quicker reactions and improved my survivability by a lot.
L4D-
L4D compared the benefits from both TF2 and HL2. The feeling of being there was amazing. When a zombie horde comes up and starts hitting you, you could feel the hits coming from every direction. When a lone zombie ambushes me, I am much quicker to respond. I don't have to do a quick 360 flip like I do with a mouse. I can feel the direction that I am being attacked from the falcon and can more quickly and accurately take out the threat.
BF2-
When I first played BF2 with the falcon, I had more trouble when with the source games. I had trouble aiming at first, but once I got the hang of it, it became very easy. Once I mastered shooting, I tried my hand at flying. I am normally a very good pilot, I used to do stunts for videos even. However, the falcon was very hard to fly with. I like how it basically became a flight stick.(I swapped out the pistol grip for the ball for flying) At first, I had no clue that to go up and down, you pushed the falcon in and out. Once I figured this out, I could actually take off from the airstrip

However, the movements felt a little sticky for my personal preference. I would either go in too far, resulting in over turning, or not far enough and I would not move as much as I needed to. This would result in over compensating and many frustrating crashes. I tried upping and lowering the sensitivity, but nothing seemed to help me. Two other things I that I did not like about BF2 was the recoil and not being able to use a mouse. I was expecting some amazing recoil, using machine guns like the SAW, shooting a rocket launcher, and driving a tank, but even with the settings maxed, it was like shooting the pistol from HL2. I was semi disappointed by this, but it would not deter me from buying a falcon. I also mentioned not being able to use a mouse. I found that to be annoying because I could in all the other source games I have and found it easier to use a mouse in menus then the falcon(because of my inexperience). Like I mentioned with the recoil, this would not stop me from buying a falcon because of this functionality, but it was an annoyance.
Overall, I would HIGHLY recommend getting the falcon. You will enjoy your games more and play better with a falcon.