It should be okay. It's probably the most popular choice. But a more secure method may be to install the MyEtherWallet on your local machine. It's very, very simple.

You can find the link to download the website from the bottom of their their website, which will lead you to https://github.com/kvhnuke/etherwallet/releases/tag/v3.10.9.7

(however, always check to make sure you are on the correct MyEtherWallet website + green SSL bar)

Some people run the website locally from a separate machine that isn't connected to the internet. There's a way to post offline transactions.

Hope this helps