Mini sessions definitely have their limitations, the biggest being time...but here's a few things to consider when deciding if a mini session is right for your family.
Pros - Fast session and budget friendly.
Cons - If your kids need time to warm up there isn't a lot of wiggle room for that, if you are late your time can not be made up as minis are booked back to back, photographer has complete say of location, sessions will only be rescheduled for weather if it is raining (overcast will still go on as scheduled), if you need to reschedule due to sickness you may have to wait till the next season (fall especially sells out and you may not be able to get in). Should you need to cancel due to illness you can switch to another available date, but if none are available your deposit is good towards another session within 6 months of your original date...fall sells out so that is another risk to a fall session, you may have to switch to a full fall session should your child become ill and you don't want to wait till spring for another mini.