What does the software or service do well? I use 1&1 for my domain and webmail services. Although I have some difficulties with navigating through its services, for me it has worked just fine. As every other platform it requires using and navigating to get the hang of it. 1&1 has a lot of services you can add to your domain, such as, website builder and cloud storage. I believe the best feature is the webmail!
What does the software or service not do well? I believe 1&1 could improve its website builder services. There are other website building platforms that are easier and have more features.
What do you wish you had known about the software or service before using? The service I bought meets my current needs, but soon I might have to pay a little more to include new email addresses for new employees. I didn't pay too much attention to the number of emails included.
Have you used a competitor to the software or service? If so, how does it compare? Yes, I currently other webmail services for other companies and by far 1&1 has been the best solution for me.