You didn't say where you are considering moving from, but be aware that the Seattle area has awful traffic. And I 405 into and out of Bellevue is among the worst in the area.
Yes, we're all hoping for light rail soon, but it isn't even in the planning stages yet, so it's at least a decade away. So when making your decision, think about whether you can afford to live close enough to limit your commute, or if you are willing to put up with the traffic.
Otherwise, Bellevue is a nice place. Reminds me a lot of the Walnut Creek CA area. Kinda upscale, a nice developing downtown, but still quieter and friendlier than Seattle in some ways. If you have kids, the school districts in and around Bellevue are good. You are close to a plethora of outdoor activity possibilities.
In typical Seattle fashion, the winters are dark and damp. Right now our summers feel that way a bit too as we've had a wet summer!