It's better than having integrated headphones I think. If the included ones (however basic they are) are in-ear, then the immersion and sound quality would likely be better than anything that would be attached to the headset.

Onboard audio is just a waste of money for something that neither casuals nor enthusiasts would care about (former by definition, latter because they would prefer to use their own audio gear).

Lack of wireless is a definite minus though.