Gargoyle's Stoneplate does not perform as described / needs more clarity

Gargoyle's Stoneplate: UNIQUE – METALLICIZE: Increases health by 40% and increases champion size, but reduces the damage you deal by 60% for 4 seconds. If STONE SKIN is active, instead increases maximum health by 100% (90 second cooldown).

I just tested this. It does NOT give health equal to 40% of your maximum health. It increases your maximum health by 40% and gives bonus health equal to 40% of your remaining health.

Now, the description in game is 'okay' for this. It isn't entirely clear (given how most other items operate, one may expect to get 40% of max health when using the active) but it could be MUCH clearer. Increases health by 40% of current health. There, done.

The issue is very compounded by the fact that nearly every website has the wrong description of the active and therefore makes it seem like you should get 40% of max health when using the active (this greatly changes how you would use the item, since it would encourage baiting by waiting until low health then gaining a massive increase, while maintaining your damage as much as possible. The existing use encourages activating it right when you're about to take a lot of damage (like Zhonya's, except with a massive 60% damage penalty afterwards). Gaining max health would make the item strong (possibly even busted) whereas gaining current health seems to make the item quite weak...

Item's active description on other websites (most of these specify increasing maximum health by 40% [which it does, it just doesn't give you that current health, as any other max health increase {like leveling up} would], however one even explicitly says it increases current health): http://leagueoflegends.wikia.com/wiki/Gargoyle_Stoneplate UNIQUE – METALLICIZE: Increases maximum health by 40% and increases champion size, but reduces the damage you deal by 60% for 4 seconds. If STONE SKIN is active, instead increases maximum health by 100% (90 second cooldown).

http://lol.gamepedia.com/Gargoyle_Stoneplate UNIQUE: For 4 seconds, grow in size and gain bonus health equal to 40% of your maximum health, but reduce damage dealt by 60%. If Stone Skin is active, the health increase becomes 100% instead.

http://www.mobafire.com/league-of-legends/item/gargoyle-stoneplate-338 UNIQUE Active: Metallicize: Increases maximum health by 40% and increases champion size, but reduces the damage you deal by 60% for 4 seconds. If Stone Skin is active, instead increases maximum health by 100% (90 second cooldown).

http://www.lolking.net/news/buying-time-with-gargoyle-stoneplate UNIQUE Active - Metallicize: Increases maximum health by 40% and increases champion size, but reduces the damage you deal by 60% for 4 seconds. If Stone Skin is active, instead increases maximum health by 100% (90 second cooldown). (this link actually describes this difference)

The last link is worth reading I think. It pretty much explains that the active really doesn't increase health, but is effectively damage reduction that also reduces true damage (via the health increases work-around). When the active wears off, you actually lose health even if your max health capacity is high enough to keep it (again, unlike any other health increase in the game). This is really weird for an item - which is fine if it's strong enough and has it's uses, but please make it more clear exactly what the item does. No where in the item description does it say I'll lose health when the active wears off. No where does it say the health I'm gaining is based on current health (although this could be assumed, why make us assume it).