Breast milk is like drinking the milk at the end of a bowl of Frosted Flakes. Or so I hear.

I know the baby prefers it to formula.
If it were up to me, I'd probably nurse for 1-2 years. But I'm out of the house and away from the baby for 13-15 hours a day. Pumping 4-5 times a day at work, 20-30 min per break, isn't exactly feasible. I'd have to work an extra hour or two to make up the break time, and I only see her 2 hours until she goes to bed as it is. And milk supply is all supply and demand - if pumping/nursing slows down, the milk supply drops. As soon as I went back to work, my supply dropped dramatically because I couldn't possibly continue pumping every other hour like she was eating.
I combo feed now with soy formula and breastmilk, which was very hard for me, but honestly, as soon as we took that step, my stress level dropped. I was so worried all day long that I wasn't pumping enough for her to eat the next day. As soon as I gave my mom a container of back-up formula and stopped worrying about it, I felt so much better. She's happy, I'm happy, she's still getting immunities from breastmilk but I'm not constantly worried that she's not gaining weight or will starve to death while I work.

I didn't think I could make it to 6 months with my health issues and with working/pumping, but she'll be 8 months and we're still limping along.