I was a bit skeptical about the suction at first, but the two interchangeable cups make a real difference once you find the right fit. The automatic pumping pattern is surprisingly steady, and it's quiet enough that I don't worry about roommates hearing anything.
I wasn't expecting the two interchangeable cups to make such a difference, but the smaller one fits perfectly and the larger still works fine on my nipples. Being rechargeable instead of hunting for batteries is a big plus too.
The suction is surprisingly strong, and I like that both cups swap out easily depending on where I'm using it. Charges fast too, and the whole thing feels well made for the price.