We had a nice experience at Science Central. Our two 7-year-olds and 6-year-old were kept "busy" for about 3 hours. The scheduled demonstrations were cool. Most of the exhibits were in good working condition; a few need some TLC.
The facility is housed in a former electrical plant, which was cool, especially since some of the old equipment is still on display.
The most disappointing aspect of SC was the lack of staff for the "rides" such as the big slide and the high-wire bicycle. If you're visit was not planned in conjunction with when those were staffed, you were unable to experience them. (Difficult to explain to kids too.)
We'd stop back when we were in the area.