We've switched from Intercom, so I'll highlight the biggest differences between HelpCrunch and Intercom:
1) Prices - Helpcrunch became a 7 x cheaper solution for our customer support compared to Intercom
2) Their customer service guys rock.
3) Some cool neat features that Intercom didn't have
CONS: can't think of anything, just looking forward to their Knowledgebase feature release
Just try it, import your contacts from Intercom in 1 minute, and you're good to test it. You'll be so happy looking at your bills next month :)