jbudgeon,
I've been living in the highlands area a little over a year. I'm borderline Issaquah though (900 and duvall/coalcreek). There's a lot of new housing being built in the area. For the most part, I like it. Depending on the area you're in, there's easy access to a lot of stores.
I also work in tacoma, at ~7am, it takes me about 35-40mins to get to work. I leave work about 4:40-5pm and usually get home by 6pm in heavy traffic. Depending on the day and phase of the moon. It can range from 40-75mins. I5 is no problem. It's mainly 405 that you get stuck in. They're also adding an addtional lane from 167 to 169. That's where the backup usually starts. It should get better once the lanes get finished.