How is online so far on Nascar 25?

Yes I'm sure people wreck and are bad drivers. How are the servers, is there any noticeable desync? I don't think I've played a solid online Nascar game since 2009.

Only thing that seems terrible is 8 person max with voice chat on. Voice chat always provides an extra level of entertainment on Nascar games. Can anyone confirm you can fill with AI in the 8 person voice lobbies? I'd assume you can.