I like that when I am working on an account in Salesforce, my calls log right on the account page. I also do like that I get emails when I get a voicemail so that I can either check it that way or via the Five9 on Salesforce.
I dislike that sometimes Five9 will log me out or not be able to complete calls. It also does not always log calls correctly. It also always will lag when a call comes in so the majority of the time so I end up having to call clients back because the call is missed. It also will drop my phone calls sometimes and that is a pain point for not only myself, but for my clients. I also dislike that sometimes the software needs to restart but it takes way too long and sometimes that requires me to restart my computer because it has not updated. It seems like there are more pain points in the system than positives.
Not the best product out there I'm sure but it does the job.
Calling my clients to sell new products and to solve problems. It is good that I can leave notes for every call so that when I look at my activity history on an account, I see the notes that have been left and can use that as a quick point of reference for what I need to do.