I pre-purchased it on steam a few months ago (mainly so that I could get a free copy of the original for my brother) and have been eagerly awaiting it since then. It was worth the wait
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I found most of the early puzzles to be easier than in Portal 1, but that was made up for with the bigger range of tools to figure out how to use/think with in the later chambers, some of which actually had me stuck for a while (I only got truly stuck on one chamber in P1). As with the first game, the dialogue is fantastic, and the addition of more characters who are also brilliantly written has strengthened this area of the game. I also found the story to be quite interesting and actually got caught off-guard by one or two things in it; unlike most games I have played.
One thing I did notice however was that in the older Aperture chambers the graphics showed up the age of the Source engine somewhat, since the textures needed to be somewhat more detailed than in the more modern style chambers. This is only a minor problem though, and overall I thought it was a great game, better than Portal 1 in my opinion.
