DO IT!!!!!!!!!!
I can't tell you how many positive changes I've seen in my alpha cat- Taz- since Rocky came to live with us. They're about 6 months apart, so both were kittens when they met. But it was a rough beginning. Be prepared to think you've made a huge mistake. They fought like WWIII and I was certain the little one was going to get squashed! They had to live in separate areas for 2 weeks. Then, one day, in the middle of a supervised fist fight, they got tired and curled up together. Friends since. They still wrestle alot, but its the fun stuff!
They are much more independent now, don't seem as clingy when I come home from work, and seem just fine if I take a weekend minibreak. My guilt factor is much lower and I honestly believe they are happier in pairs.
Good luck