I am a customer of Joyent.
For the past two days, the server on which I host some customer websites and mail servers has been down. I did not receive any warning or explanation by email or telephone. When I filed a support ticket, I was given a link to their help site with some status updates.
Status updates (paraphrased):
2011-02-26 09:22:19 GMT: server offline
2011-02-26 14:38:38 GMT: no ETA
2011-02-26 17:09:42 GMT: estimated downtime 12+ hours
2011-02-27 22:23:08 GMT: estimated downtime 20+ hours
That final estimate of 20+ hours is in addition to what is now 37 hours of downtime. Joyent has offered no reparation or backup service (e.g. backup MX service to keep mail from bouncing).
For your consideration when choosing hosting providers.