I haven't tried them either but from my first impressions there's still a wall between the conversations people are having via the support system and those that people remember to add to the CRM. e.g. the sales guy trying to up-sell someone to v2.0 may have no idea that the customer already has two open support tickets from the 2.0 beta program.

The problem here is that these are fragmented systems, each trying to solve specific needs for the company (tracking sales/prospects, tracking support queries) rather than looking at the customer's perspective.