We have been using kangaroo since we opened our daycare center in 2014 - it is very easy! You can set reminders easily through SMS or email notifications which I love because there are some people that don't always check emails frequently so this helps them as well by not having an app constantly pinging at you about something they need help doing.
There's nothing i dislike too much but maybe if more options were available (like different pricing plans) then other providers would start offering similar services instead of just copying us? They also make great products like play kitchens etc., everything looks beautiful when displayed online compared to most competitors who use plain white boxes/bins :(.