We had to switch my daughter to this after she couldn't breastfeed. We tried the green can "Protect" but it was really hard on her stomach. I will definitely use gentle in the future if I can't breastfeed.
While it is very fun to go in and play with everything and try it all out, I have never and probably will never buy anything. The prices are ridiculous! A $4000 massage chair? $50 for sand that doesn't make a mess? Wal-Mart has the sand for $20!