IAMS cat foods

I picked up a small bag this afternoon of the new IAMS Multi-cat
formula. The ads I've seen say it's going to do the same things my
current combination of weight-control and hairball formula foods do.
Before I start phasing this stuff in, I thought I'd ask what folks
think of IAMS. The cats seem to really enjoy the sample, and are trying
to get into the bag as I'm typing. I have a 9 year old spayed female
who weights a bit more than she should and a lean, mean 4 year old
neutered male. We currently feed Nutro, but there are always a lot of
food nerds left after the kids crunch their way through the flattened
out triangular pieces of food. New food comes in smaller pieces.
Thanks for any input/ comments.

Cindy
(Mom to Roxy, the Wonder Cat and The Amazing Thunder)