Instruct: Classify Amazon reviews into positive or negative sentiment
Query: what good are all its features if the screen is horrible...

I am amazed at how many good reviews this unit..and the C320 get. The design of the glaring screen and lack of brightness makes it basically unreadable on sunny days..and polarized sunglassed make it worse. And tech support is only open during normal business hours...what good is that?? Most recreational users of this use it after business hours and on weekends....again....people give tech support 5 stars...why? Maybe some people have low expectations of things..but for units that cost hundreds of dollars with poor designs and lack of GOOD customer service is not too much to ask for..Magellan screen much better and they are available via phone after hours..may have to hold..but at least you can get a live person..I try to buy american and Magellan (Thales) is a foreign company..but they are years ahead of us in many ways.