I like that bluemind works with my google apps account so it's easy for me to do everything from one place! It also has great customer support which helps when you need help or have questions about something in particular.
The interface could be more user friendly but this isn't really an issue since bluemind does what they say they will do without any problems at all. If your looking for another email provider then definitely give blue mind a try out because their prices are very reasonable compared to other providers such as outlook etc. We use bluemind primarily for our business emails however we can send messages through g mail if needed too.