Ah yes, this card...every time I open a set of Plasma Storm packs, I pull one of these. It's like a sign I should play it, or something. Maybe I should, Klinklang is one of my favorite Pokemon, haha.
This card will not be going away any time soon, purely because EX's have and will continue to dominate the metagame. It's going to be like Garbodor in a sense; you know it exists, you know what it can do, but in an unsuspecting metagame, Klinklang can be really good.
I give this an 8/10. Great ability, can be searched out by Heavy Ball, and outside of some uncommon, crazy scenarios(or Garbodor, which is not uncommon or crazy), it will only be OHKO'd by a fire-type non-EX. Its attack just makes me wish the extra 20 was tacked on to do 90 to the active, though. Not to mention, the secondary effect only works on a flip anyway. Then again, something's probably not going your way if you're attacking with this Klinklang in the first place.