Yes, you have had a great event and those overwhelmingly positive comments about you are pouring in with no intention to stop. Or, a customer of yours has had a really great experience involving your brand. I’m really glad for you. It’s ok to want to share your happyness with world, but sorry to disappoint you- retweeting every one of those reviews isn’t the way.
There is no need to try to sell yourself to your followers, they already follow you, you got them- now prove you are worthy of their attention. No, retweeting messages like “Hey, @yourbrandname are the greatest!!!” isn’t it.
This doesn’t mean that you shouldn’t retweet any mentions at all. If, for example, your customer is positively surprised because he/she has found that your product has application beyond those you have specified, or tweet includes other kinds of added value (specific information), you should retweet it- it might help your existing customers/followers.
So, choose visely and ask yourself a question: “Is this retweet going to help or entertain any of my followers?”