The Good: The protection of a MX helmet, looks, fit.
The Bad: Weight for DH use
Well, I got to start by saying this is a MX helmet and I'm not going to get on the discussion of the DH vs MX helmet thing.
The Air is another great helmet offering from TLD, with the usual great fit and confort.
Goggle wise, I used it with Spy and Oakley ones and didn't have any issue with fitment.
Being a MX helmet it is not light compared to a DH specific helmet but I gotta say that the few times I used it for DH I didn't really feel the weight penalty at all.
If you want the added protection or if you also have a MX bike and only want one helmet then the Air is really a great option for you.