I've been using this software since 2010 when it was called "Inventory Management." It's easy enough that any user can use without much training! There are some things we don't like such as not being able to have multiple warehouse locations in one account so you cannot track inventory coming into from different warehouses at once but all other functions work well with out problems.
We used this tool back then because they were doing everything (from picking order placement) themselves rather than having us do them manually.