I've used tons of plugins in self-hosted WordPress websites. Coming across a glitch or two happens from time to time. But YOP Poll has met my expectations in ease of use while still offering a full range of customizing options.
Although I had two minor glitches, the YOP Team exceeded my expectations in speed of response and in detailed instructions to fix them. THAT is the golden sign of customer service!!
5-star plugin and absolutely a 5-star support team!! :D