Instruct: Classify a given review into positive or negative sentiment.
Query: iBert...great, but not perfect

The iBert child seat is a pretty great bike seat, but it has 2 major flaws: 1) the straps DO NOT WORK, they slip right off the shoulders and are thus not secure, and 2) the mounting system does not work if your handle bars have less than 2 inches of adjustment up or down (for example, on many mountain bikes). That being said, we will still use it as it is a great way for our child to ride bikes with us and we like him being able to be up front with us so the ride can be as interactive as possible.