I have had my Surface Pro 3 i7 256 GB for 4 months and it is a work hog. I have not had any overheating issues. I have not had WiFi issues. I have not had any really noticeable CPU throttling.
I use it for College work. I am an Art student. I spend hours on it running my 3D animation software for homework. I also use it to play games and surf the web. Also watching hours of Netflix on it afterwards. The battery life is fine as long as you watch programs that continuously run in the back ground.
I am glad I ignored all the suspect bad reviews and purchased it. I agree with the only 0.03% being effected.