What do you think about the RFM12 transceiver to the alarm control panel?

I am building a switchboard and looking for ready modules for radio communication with my Atmegs. What do you dear colleagues think about this module, maybe some of you had contact with them ?? you can get them at http://www.jm.pl/3w/nl_show.php?id=109?=pl JM Elektronika, sa for ISM band (433MHz and 868MHz), Full-Duplex communication via SPI, something around PLN 20 + shipping costs. If you have any better ideas about communication between procks, write to us (the price is important ).

Thank you in advance
Regards