My experience of SAGEM in the EC130 is extremely negative. Although the basic autopilot does pretty much what it says on the tin (heading and altitude hold and VOR radial/GPS track capture), the rest of the SAGEM cockpit (ICDS-8) is poor. Vertical nav (ie the ability to do any sort of climb or descent under the autopilot) in our ship is controlled by a separate piece of kit from S-TEC (which is now owned by Cobham) and the integration is poor. The moving map on the SAGEM kit is truly a joke by modern standards, and the chances on them focussing on the GA market to make things better are negligable whilst they have so many other more lucrative markets.
As you'll have read from this thread there are more gotchas in this field than you could even think of, and you need to make the companies you contract man up for the work, especially where integration is involved. Secure detailed written specifications (that you can understand) from your prime contractor and get them to stand behind any third party kit they intend to use. Don't be the first to do anything if you can help it, but if you're forced to, then make sure your suppliers are sharing in the cost and risk.
The third axis will be yaw (ie. pedals) and in my experience (A109) not very well implemented even when it's present, so not worth the bother for VFR.