It's not a bad idea for a baby that small. Put on some music and something that is colorful and moving and a baby will love it. But I certainly wouldn't use it for more than maybe a half hour or so at a time. Maybe to occupy the baby while I did the dishes, or laundry, or started dinner. At that age it's not a lot different than the battery powered moving mobiles some folks use.
I wouldn't use it in place of holding the baby and interacting with him/her. Using it for a constant babysitter would be really bad. Short bursts only. Baby's need human interaction. There have been studies on kids raised in orphanages where the only human contact they had was changing and feeding. It didn't turn out well for the kids when they grew up. They grew up rather anti-social.