The good: Shipped quickly, good packaging, nice, lightweight cord which would be good for toting around.
The bad: While this is probably a great adapter for some computers, it is not the right adapter for Vostro 2510 (despite the product description given). This is a 65W AC adapter. When it's plugged into a Vostro 2510, an error message comes up warning that a 90W adapter or greater is needed. If you leave this 65W adapter plugged in, the computer runs v-e-r-y, v-e-r-y s-l-o-w. And, the the adapter is not strong enough to charge the battery--after 24 hours of charging, the battery was charged only 1% more than when the adapter was first plugged in. So, the cord pretty worthless for me.
Update: The seller, Laptopmate, did contact me directly to apologize for the misinformation in the product description and to offer to send the correct adapter. It is nice to shop with a vendor who cares about customer service. Kudos are due in that regard. I ordered a 90W adapter and it works great.