I have heard that TWC is a better cable company than AT&T. I think AT&T just doesn't care anymore. And, if they include a high def box that is great too....I've never experienced any of my installs drop out from moderate rain, but I have seen it happen before. But, before I got into this as a job years back, I had a free install done at my house in Montana, and they guy stopped aiming the dish once he got a 65-70 for signal strength...that is HORRIBLE.
I won't stop tweaking until I get 90 or better, unless it won't give me more than 85 after LOTS of tweaking. I live in an apartment complex in MA now and the only thing that affects me now are a row of 50ft trees directly in my path, but only when they are full of leaves and it has to be really windy to cause any problems. My balcony is just in a bad spot...