It's a buggy mess. If you send a mass/bulk email, prepare yourself for a minor headache afterwards. You pretty much need to refresh the browser to return to normal answering tickets after a bulk.
Everything feels so. freaking. slow. and. clunky. Just clicking from ticket to ticket is an exercise in patience, and sometimes the filters you've applied to the ticket list will randomly disengage. So not only will you lose your place, but you have to take the time to apply the filters again. Which, like everything else, seemingly takes years.
Speaking of filters, applying them is extremely cumbersome and confusing, and doesn't always catch everything.
Need to export data? Prepared to wait. And wait. And wait. And wait for the spreadsheet to be emailed to you if you're gathering even something SOMEwhat complex in nature. Review collected by and hosted on G2.com.