So far the ability to use binoculars when deployed with a weapon or in the driver and passenger seat of vehicles is superb. Its a feature I've wanted for so long and is extremely useful. The only one area its missing is on static weapons!
I've found myself in many situations with static weapons where I had to dismount in order to get better optics. I'm sat in a game right now on a humvee watching over a long dirt road on Arland where I wish I could have it right now!