I've got this adage - if you don't ask you don't get.
If they are an unknown quantity, ask for a couple of clients that are already on the service. You can then contact them and ask how good the service is.
Or ask for a demo on site...
If you are clear that you are interested, but concerned that you might not get the performance you're looking for, they could be reasonably co-operative.
Worth a shot for your peace of mind.
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