I use teamwork for every project, small, medium or big size (up to 600mb is my experience) with AC 16.
I don't get "serious" teamwork errors since a couple of years.
I think that the teamwork implemented in Archicad is a great way to manage large shared file. And it works great even over the Internet.
eng. Alessandro Mandala - Italy
AC27 latest hotfix
Win 10 Pro 64bit
Double XEON 14 CORES (tot 28 physical cores) - 32GB RAM - SSD 256GB - Nvidia Quadro K620
Display DELL 2560x1440