I had to Google what they are. As far as collector figures go I prefer screen accuracy. Some of the stuff Sideshow and Hot Toys produce are amazing. These figures are super expensive and seem to sell out faster than limited edition soundtracks too. So it's a hobby for those with a lot of disposable income. You snooze you lose. I can't afford the hobby!
Funko makes some really fun figures, but hunting down some of the limited editions are more trouble than they are worth. For example, at this past Comic Con I tried to obtain this exclusive:
To be able to buy this I needed to stand in one line early in the morning for the chance to stand in yet another line later in the day, and then hope the figure you want isn't sold out by the time you finally get to a position where you can purchase from a Funko salesman. Once I saw how difficult it was, I quickly gave up on trying to purchase any of the exclusives. I did check back from time to time, but if you weren't in the early morning line you were out of luck.