Good morning. If there is any way possible that you could have a friend to come over and feed your fish while you're gone would be best. Premeasure the food into zip lock bags for each feeding. That way you won't have to worry about coming home to a dirty brown tank due to over feeding. Hide the remainder of the food. People not used to feeding fish will think Oh, they're still hungry and feed them more causing a nasty tank and throwing you into a mini cycle.
I've tried a cheap version of the automatic feeders which caused another mess. It got wet, the food was soggy and the thing clogged. I've seen others with the more expensive type have some success though.
I've never used the weekend or 5 day or 7 day feeders.
Too, I would suggest a
water change a day or two before you leave.
Have a safe trip!