Keep it, it's a fine gun.
They don't sell for much ($140 new in stores) but they are nice guns.
It is basically a Mossberg 500 with only 2 differences:
1. The forend is simplified, so you can't put a forward pistol grip on it.
2. The safety in on the trigger guard instead of the reciever.
ALL parts are interchangeable with the Mossberg 500 except the forend and trigger assembly. In fact, the Maverick shotguns are made by Mossberg.
If you would keep a Mossberg 500, than you should keep the Maverick. I own both and the Maverick is every bit as good. Mine has been 100% reliable, just like my 500.