Yea, I saw that service too.  I got the impression that it was one of those
sites where you ask the question, and they give you the answer, but nothing
more.  It's intended for independant service shops that need to service
Mitsu vehicles, and may not have the latest manuals on hand.  Other OEMs
also offer the service for their vehicles. It's a way to get service
information to independant service shops.  For the amount of times you'd use
your subscription, it's probably not worth it.  It would be cheaper to buy
the manual.  If your manual doesn't answer your question, ask it here, there
are some knowledgable people here.
If there is not a disclaimer ( for Canada and USA cars only for example) I
would suspect it covers all countries, but I don't know that for sure.

I have a 2003 Eclipse and it's surprising how many times I check the manual.
Not for repairs, the car's been perfect, but just for general interest, or
information on how to add things, maintenace schedules, specs, etc.  I don't
buy anything, without the service manual, it's a condition of sale, for me.
Everything you will ever need to know to repair your vehicle will be in the
factory service manual.  However, that said, there is still alot of
information that only experieance (yours or someone elses) will be able to
provide.
While the subscription will give you the information needed to  repair a
problem, there may be a better/ cheaper way to do the repair than the
factory authorized way.
For example, replaceing the water pump, when doing the timing belt, will
save you money down the road.

Buy the factory service manual.