The thing that I like most about using Proton Mail for Business, is the simplicity of using the product. As a travel blog writer, I am the only person and "I wear many hats". Pointing the domain server to Proton Mail is something I can easily do, and I can add or remove email addresses quickly when needed, like when a domain needs to verify "webmaster@" instead of "admin@" for example. Review collected by and hosted on G2.com.
The least helpful aspect of using Proton Mail for Business is that I haven't learned how to build templates, for newsletters, promotions, etc. This is most likely reflects my lack of knowledge, however. Review collected by and hosted on G2.com.