The ability to view multiple employer plans in one place, as well as being able to link them together into group retirement accounts is what I like best about this software package from PenFax.
It's also great that it integrates with my payroll service provider so all plan documents are automatically uploaded when they're updated via Paychex or ADP. Not enough features at this time but I do appreciate how easy it was to set up our first Plan A/B account within minutes! We've been using this platform since 2010 without any issues (other than waiting 2 years before we could actually see results!).