Excel 2013 password security.

I'm using the password protect feature of Excel 2013, a third party recently commented that there was next to no security using this method. I set about trying to prove this but from what I have read its quite secure in 2013 due to the encryption level being used. Am I correct as I'd like to prove this if it is otherwise. I'm not trying to look for a different solution just trying to prove this theory.
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RayData AnalystCommented:
Danny ChildIT ManagerCommented:
If it's Office 2013, and they're NOT in Compatibility Mode, the passwords are quite tough.
Elcomsoft are a pretty respected firm in terms of removing passwords, and even they have to revert to brute force with multiple CPU and GPU attacks.
 - see the end of that page.

I ran their product on an 8 core CPU system (best I had) 3 years ago, and it broke an 8 character password in 3 days.
Older passwords could be broken instantly, but I don't think that's now the case.
Sid_FAuthor Commented:
I have tried multiple tools, forums and articles and have been unable to crack an excel 2013 password. I conclude that it is far from easy to crack a password in excel 2013 despite what people may think! I also tried the above tool.

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Sid_FAuthor Commented:
As per my post passwords are not easy to crack in Excel 2013
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