I've never spoken to anyone using EasyVista for SAM. That's not to say it's not possible or perfectly capable solution, but it's certainly not a popular SAM solution in my opinion. On the plus side, EasyVista grew from a company in France called Staff & Line which foundations were in ITAM. If I remember correctly they did ITAM long before they did ITSM. From an ITAM perspective I would consider it a good solution for HAM within ITSM but not SAM.