The ability to link in with existing systems is one of our favorite features about this product! No issues at present though we are still working through some kinks as well but nothing that has been identified by us so far which would be an issue for me personally or my team members who use it every day. We have not found anything specific yet however if you get stuck during setup feel free ask questions here - there's usually someone around willing/able enough help out :) I like how easy they make things seem when first starting off using their software- very friendly people too ;) Great customer service & support staff!! Keep up your great work guys.