Typically I void the warranty within 30 minutes of getting a gun.. "opening this seal voids warranty."
There is nothing wrong with E1, dboy, cyma, etc. Let me or any decent tech tune your chinese clone and it'll perform better and last longer than a $300 gun at half the price (not always the case). Of course, some people dont care for their guns so they want these "lipo ready," "already upgraded," "best gun on teh market." Its a hoax to get your money. The passion of tech work and care for the guns seems to be diminishing with the technology on an everyday airsofter basis, which is what other members here may have been getting at when they said "old school," though is seemed to hint at a more social innuendo. But there are notable techs who keep striving to push the limits of the sport, within their own means.
At any rate, no manufacturer is perfect. Pick your poison i guess.