My son collects these.

He has both the Bumblebee and the Optimus track sets and a few of the single characters. Truth be told these are REALLY hard to get here in HK.

The 5 pack energon set came out here and sold out within 2 days (I know this for a fact as I saw it on the shelves in Toys R Us, made a note of it so "Santa" could go back and get it and then when I did go back in, all their stores had sold out of all their stock and it has never restocked).

The Jenga Games never made it onto shelves here but my son was REALLY hoping for the OP one. I've never seen the vehicle packs here either.

The single packs have just been re-released here in very limited supply last week. I got a couple the other day - Optimus, Soundwave (HK$69 each) that were on my sons list.
He loves these sets - especially the Optimus race track and he uses the characters in-game as well. My only gripe is his Grimlock bird came missing a screw and so one of the arms always falls off (seems to be a thing with Grimlocks and arms I am discovering - his FoC Grimlock is ALWAYS loosing its dino arms too!).