Pro's:
They have good templates, you can easily create and send inviations.
Easy contact import from a excel or csv file
Con's:
Most of the guests do not receive the invites. They must get blocked by spam filters.
There is no option to resend, other than deleting the contact and creating a new one.
No customer support phone number
They do not respond to written customer support.
Stay away, it starts out great but then turns into your worst nightmare.