Some Starcraft II secrets revealed: "What league you’re in does not affect matchmaking"

Blizzard have begun to remove the shroud of mystery around Starcraft II's superb matchmaking system.

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Ulvareth's post on the Official Starcraft blog manages to explain some of the the intricacies of the ladder system. Here are some of the main points:

• Leagues are each roughly 20% of the player total so the skill difference within a league can be massive.
• A promotion does not mean that your next matches will suddenly be more of a challenge than your previous ones.
• No matter what league you're in, you may very well find yourself playing against opponents from other leagues than your own. In short: what league you're in does not affect matchmaking.

What's your experience of Starcraft II's matchmaking system? Are you top of your league, or sadly moping around 92nd place?