Hello! I did a quick search and came up with a Hans Christian owners' web site that should be very useful:
Hans Christian Owners Association (HCOA)
Also, you might want to ask the designer, Robert Perry, directly. He posts and watches things in the Sailing Anarchy cruisers' forum on a regular basis:
Cruising Anarchy - Sailing Anarchy Forums
The Hans Christians are in general very popular heavier displacement cruising boats. Like all boat that are 20 years old, there will inevitably be maintenance issues, some common due to build/construction, and others due to quality of maintenance. There are several in our area, but I haven't sailed one so feel limited as what I could add. That said, I'd think a 43 would make a very comfy live aboard.