I've only had my bengals for 2 months now, they'll be 5 months old in a few days. Getting two it's the best decision you can make, obviously circumstances/money permitting. I spend 10 or more hours away from home and getting just one was not an option. They keep each other company, chase each other and overall have a great time together. Also at night, they haven't so far had a tendency to wake me up as they play with each other and are quite quiet about it. True, you find the strangest things scattered around the floor in the morning :).
Sometimes, however, two cats means more hassle and effort, especially if you're cleaning the litter boxes and have to defend your "prey" against two cats
. Regardless of them having fun together they will want to play with you anyway.
I would totally recommend getting two, it's a different experience than having a single cat and especially if you live on your own it's also much better for the cat(s).