Getting a membership at the ROM was an excellent decision. Not only does it help support an incredible institution, being able to go whenever you want, even if only for an hour or two to check out one exhibit in detail, is excellent.
The ROM's a family friendly place - lots of exhibits are specifically aimed at children, and their staff are great at working with kids. For adults, there's a lot to see, and it's not a place you can see all in a day, that's for sure.
I've been going since I was a kid, when the school trip to the ROM was the highlight of the year, and I never get tired of it, I always manage to find something new I haven't paid much attention to before there. Never mind that, there's all manner of traveling exhibits which pass through. The Terra Cotta Army exhibit was what persuaded me to become a member.