Mine is a 100 ft long, so keeping it untangled is paramount. I have one of those cord reels to wind it up on.
Interestingly the extension cord costs me more than double what I paid for the electric chainsaw! The chainsaw was on a closeout/markdown table at OSH for only $30. I definitely like electric better. Every time I use a gas chainsaw it seems I have to yank on the cord about a thousand times to get the darn thing started. I end up exhausted before I've even begun!