I like everything about this product! It's intuitive (it reminds me of Cisco phones) and easy enough to use even if you are not very tech savvy. We have used it at two different companies now and we love both products. There isn't anything that really bugs us. If there was something specific that annoyed us then maybe we would think otherwise but overall its great. The support from Nexxa has been outstanding too as they were always willing to help out whenever needed. Nothing so far - just pleased customers who had purchased before us loved them! Our business works better when everyone can communicate easily and fast which makes our lives easier because then people know what other departments need done without having to ask anyone individually.