SteelSeries and the Sensei used to be my favorite mouse until it failed after 9 months of heavy use (laser sensor failed).
I'm sorry to hear that.
My experience with the Sensi Raw have been really good, for me, personally. It's a perfect blend of aesthetics and performance for daily use and gaming; love the rubberized finish, too.
I have the Siberia V2 headset as well, and while they aren't earth shattering, they have held up well.
But I have to echo your sentiments about their customer service: it is absolutely deplorable. I made the mistake of ordering directly from their website, and they didn't actually ship my order until I hounded them for an answer as to why I didn't receive tracking (3 weeks later). My worst experience ordering PC peripherals, by far.