This place is awesome....just get there before noon, or you will have a hard time finding a place to sit.
Bright Horizons at the Summit in Bellevue is excellent. Both of my kids attended in infant and toddler care there (I had to move them because it was too expensive for me to afford both of them there). The teachers are top notch, and the turn over is very low. They take their jobs seriously and are professional, warm and loving. I've visited and tried out several daycare in Bellevue and I can say from experience that this place is superior.
The primary drawback is cost--you either needs to be very well off or in a dual income family with two well paid professionals to afford having your kids here.
Sundance is a good place. The kids are well cared for, the teachers are warm and loving, and they have a nice (not fancy) facility. Some of the pros also include a good schedule and curriculum, a decent level of organization, good teachers, great location and reasonable cost (compared with very high cost care options in Bellevue).
Areas improvement include cleanliness around diapering and bathrooms, making sure the kids wash their hands (this is definitely an issue which could be helped by making sure there are study steps for kids to stand on), ensuring that there are adequate staff members early in the morning (a big issue).
This is a good place where I feel good about sending my kid, and its definitely better than most daycare's in Bellevue, but its not at the level of Bright Horizons or Bellevue Montessori.
I initially brought my child here after speaking with the owner and teachers, who were warm and inviting. However, I quickly realized that the care was substandard and there were clear violations of state laws. The major issues were:
1) There were not enough staff to care for the kids (for example there was often only one teacher there in the AM to care for 6+infants). 2) When I would show up in the middle of the day, there were sometimes random teenagers (maybe the kids of one of the teachers) walking around with their dirty shoes on in the infant room. 3) They used a an intense smelling carpet cleaner on their rug and my baby came home smelling like chemicals.
I understand this is low-cost childcare and that some people have no other option, but this place had unacceptably poor care. Sadly this is not all that uncommon in WA.