Uptivity (previously called CallCopy) is quite good, my company has been using it for years. It can be set up either at the port/vlan mirroring level, or with individual phones/lines using Built In Bridge on the phones and a SIP trunk to the Uptivity server, or I believe there's a MediaSense integration option as well.
There's built in QA tools, and optional screen capture. They've got some cool voice analytics tools as well, though I haven't had a chance to use that product.
Thank you for sharing. We are looking at Calabrio and Nice, anyone who has experience on them? We can ask them for demo but would just like to get a perspective apart from their sales staff who usually shows only the good side :)