Most of these points have been covered by other reviewers, so I'll summarize the ones I'm in agreement with.
Pluses:
- lots to keep the little ones occupied (climbing structures, trampoline, toys, etc.)
- bright, clean space
- free coffee/tea
- separate eating/snack area
- good changing, nursing and activity facilities
Minuses:
- getting a bit pricey, especially if you're only bringing one child
- expiring memberships (as noted by another reviewer)
- gets very busy at times (sometimes there's a wait to get in)