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Lifting an H2 like that isn't cheap and putting it back to stock won't be cheap either! Ask the seller if he has the original suspension parts he can give you. Also consider having a GM dealership that knows H2's inspect it, check out the computer, look for frame issues and damage.
Make sure the lift mods can be reversed and make sure it can be aligned to specs. The H2 is becoming a collectors item and you might want to put it back stock later on.
If you plan on keeping it lifted and satisfied that it is a toy (and not a daily driver) go for it. Just make sure to do your homework, otherwise it could turn into a nightmare.