Pros:
- Unlimited mailbox, as much as you want, so much and pay. (You can also get free on Yandex.Mail and @mail.ru)
- Possibility to have your own domain name. (It's cheaper to buy a domain name elsewhere and use the Yandex or Gmail mail).
Cons: paid mail services are much less developed than free ones.
Conclusion: There is no point in paying for what you can get for nothing, and even with a prospect.
