HipChat integrations can be frustrating/lacking and I often find myself resorting to Zapier. The integration with JIRA is a joke and a huge pain to setup/manage for large workflows, which is especially surprising since HipChat and JIRA are both part of Atlassian.

I do like the newest version of the HipChat Mac app a lot though.

I'm not sure the integration frustrations merit the 4x cost increase in switching to Slack though. Hard to justify that unless your team is very small.