Synching, or rather sharing contacts between Gmail accounts

Started using more than one gmail account now (without forwarding because I need separate inboxes) but send email so common addresses, so I wanted to sync my contacts. The solution I settled with was using Shared Groups that can (surprise) share a contact group across accounts. The least problematic approach (to avoid duplicates) seems to be to create a new group, share that, and put any contacts that need to be shared into that group.