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I have one of these: [link] . I'm extremely happy with it. The only minor complaint I have is that since I have fairly bony elbows, they tend to hurt a bit after resting on the armrests for several hours. But only if it's the elbows specifically, if I just lie my arms across them (say if I'm watching a film), they're really comfy.
It's worth mentioning that most of the time my arms are suspended in midair anyway, so it's not much of an issue.