Ask HN: GoGrid or other server image providers?

I need to create a server image and configure it with special software. Then I need to replicate this pre-configured server horizontally for lots of data access on an intermittent basis.

I've looked briefly at GoGrid and it seems they offer this type of service. My questions:

Does anyone have experience with GoGrid that they can share?

Are their other companies offering similar services that you might suggest or recommend?

Are their other alternatives that may be better or more appropriate to occasionally high volume use but most of the time very limited use?