I owned an Xti for a few years, and IMO, I felt that I had reached the highest level of possibilities with that camera.
1 month before the 7D came out, I went and purchased a 50D as my first real upgrade, I bought this on an impulse becuase my wife and myself were expecting our first child, and I didn't want to take a chance of not having perfect pictures of my daughter during her arrival in this world.
I was blown away by what the 50D offered compared to the Xti, and I truly felt like I made the best decision.
Then I found out about the 7D coming out, and I was ready to kick myself in the butt. So I returned the 50D (luckily Best Buy took the 50D back a MONTH later) and picked up the 7D.
At first, I was very dissapointed comparing the shots from the 50D with the 7D, I almost felt like I made the wrong choice. This was ONLY becuase I had not yet figured out how to take advantage of what the 7D offered.
That was in November, and over a month later, I am taking FAR better shots now with the 7D, compared to the 50D & Xti.
I would not trade this in for anything at this point, it serves my purposes very well.
I say give it some time, learn the new features and how to use them, and you too will be very impressed with the results.