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Flexibility in that there is more than one way to use the service, VOIP phones are not required so if you are on a budget.....
When we started with Aptela they were going through some growing pains, that was six years ago.  We stuck with them becuase we couldn't find another provider who could give us what Aptela was giving us.  After about 6 months of 95% satisfaction I can honestly say we have been 99.9% satisfied with the service (always room for improvement).  We are a virual firm and when we switched to Aptela it made it that much easier to be virtual.  No more pagers!
They have matured as the industry has matured, they have just been at it longer so are more mature!