Looking at the price difference, it's $25.00. You can find a really nice hand compass for that.
For me it's a Wife Acceptance Factor (WAF). We have a good compass and a Legend currently. When I went to order our new GPS (I knew I wanted an H series) she said, "Make sure you get one with a compass."
The reason? She hates me having the bag with the compass in it when she decides she needs to give me a heading. This way we will both have a compass, and she only needs th GPS.