I just completed an upgrade to Sunshop 4.3.4 for one of my clients. Overall the upgrade went well, with minimal errors to flesh out. With these upgrades the major issues are syncing up templates, and any code changes that were made. In this case, the code changes were nil, but the old site was running 4.2.0, so many templates had changed. For security reasons, I’m not listing the site (no need to broadcast any info about the software being run there).

In general if you can afford to upgrade to 4.3.4, that’s recommended. There are just too many security issues in the older versions. Even with patches applied, it’s best to do the upgrade.