If your play yard is going to function mostly as a play space for your baby, or you're on a tight budget, you can probably go with a basic model and skip the accessories such as mobiles and bassinet insert. A pair of lockable wheels or swivel casters on one end of the yard will make it easier to move from room to room. If you'll use it for travel, you'll want a play yard that's lightweight, folds quickly and compactly, and has a carrying case. You may even want to be able to roll the packed unit. A carrying bag that allows the play yard's wheels to roll when it's packed is ideal.
Some play yards feature a mobile with suspended toys or a detachable baby gym that can also be used with the bassinet mattress on the floor as a separate play mat for tummy time. These are a bonus, as are entertainment centers with music, soothing sounds, and lights. But all will contribute to the price and weight of the yard, and will make it more difficult to pack up the play yard for storage or travel. They usually require C or AA batteries (not included). Toys may not be necessary if you intend to use your play yard as just a portable nursery. But if you use a play yard as a mobile activity center, toys and sound effects can be helpful.
This is an adorable playpen, however I want to warn you the description is a bit misleading. I thought one of the panels included an activity board. It is listed under the details section and there are multiple pictures of the activity board seen in the customer review section. The playpen I received did not have the activity board. I was so disappointed b/c I know my daughter would have loved it. I contacted the seller and they basically said sorry for the confusion, but there is not an activity board included. False advertisement!
Some attach to the longer top rail—you have to remove them to get them out of the way. Others simply rest on the long rails and are hinged at one shorter side rail so the changing station can be flipped over the rail to hang at the outer side of the play yard. We think it's safer to remove the changing table when not in use so it is out of reach of your baby and any other children. In addition, it is always better to have an active means of attachment to the frame—that is you have to click, snap, button, or strap a changing table or bassinet into place rather than just have it resting on a frame.
It's helped us out tremendously. It provides a way for us to cordon off a safe space for our son while allowing him an area to freely move. The fact that it breaks apart and can be arranged in various patterns allowed us to expand that space with some creative use of furniture. Sadly though like all young raptors, he's testing the gates, looking for weaknesses that he'll eventually use to escape and terrorize the local populace of cats.