They have been very helpful in implementing our network at my work place, they are always willing to help out with any issue or question that we may come across as well has being able to provide us advice when it comes time for upgrades/changes within their products! I don't like how slow some of them can be sometimes but overall not much dislike about this product so far!! Highly recommend.
Nothing yet really nothing too bad either just trying new things here & there which you would expect from an upgrade service provider such as themselves :).