I love that I can take calls from any phone and it is accessible anywhere. I can make calls from any computer and it is accessible from anywhere. I can also take calls from any mobile device and have it ring through my work phone. It is very user friendly. There is a learning curve at first, but once you get it you can make calls from anywhere and at anytime. It is very helpful because I can take calls for my clients so they don't have to. The capability to send out mass text messages in real time is amazing! I love that it's always updating as we respond to things. It can be slow at times but other than that there isn't anything bad about this product. We use sales sling to communicate our clients so they know what their bill is due each month and also receive invoices. This has helped tremendously and allows me to keep my customer service up to date without having to check multiple sites throughout the day.