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I wish they would explain what this GSM shield does apart from the one year subscription and connection to their own platform?

There are several unlocked GSM shields and modules available with working libraries and tutorials for under $50, using the exact same GSM module (SIM900): http://dx.com/s/Sim900?category=499

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None of those appear to be Arduino "shields", unless I'm not looking at them correctly? An Arduino shield is plug/play, whereas I would define a generic "module" as not.

This one is a shield: http://dx.com/p/manolins-sim-900-gsm-gprs-shield-expansion-b...

And so is this: http://dx.com/p/arduino-compatible-gsm-gprs-shield-wireless-...

And this (includes an Arduino Uno compatible board for $80):http://dx.com/p/elecfreaks-diy-gprs-gsm-learning-development...

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