I have two out of my three monitors on six foot extensions. At first I tried to save a few bucks and the reult was ghosting on the monitor with the cheap extention.
By good quality I mean the extensions with the little canister things (forget what they are calle) at either end, this is what prevents interference.
Your gold plated sounds high end, check for the plastic vcoated canisters on each end and you should be fine.