> How easy are those modules to use?  If reliability is an issue, do you
> need to use an error detecting code?

As the modules are tranceivers, you can use any two-way protocol
you like to check data integrity. So far I've not tested the limits as the
range is presently well within their capabilities

> Also, do you know of a north american supplier for a part like that?  All
> I've been able to find is something similar at qkits.com  for twice the
> price.

If it's any help, the chip on the ones I have here is a Nordic nRF401

http://www.nvlsi.no/index.cfm?obj=product&act=display&pro=56

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