I ordered my Camaro SS last July, simply because the vehicle with the options I wanted really didn't exist (anywhere in the country, seriously). If I was going to spend the $$$ on a car like this, I wasn't settling for a color or options I did or did not want.
My salesman was amazing and made the process very clear/easy. Basically, I would get the dealership discount off MSRP (some $2000 or so) and I was at the mercy of whatever incentives (if any) were available at delivery by Chevy. It was not locked in at order, so that was the only caveat. But I wasn't going to sweat over $1-2K, potentially. The incentives didn't change any, so it made no difference in my case.
Picked my options and they got the car ordered. Exactly 8 weeks to the day, it showed up on the lot and was ready for pickup.
I'd gladly do it again in the future, especially to get exactly what I want.