I have also heard that there is a flavor difference between liquid and dry. I personally have only used dry, and I am happy with the results so far. When hydrated and proofed, my pitch goes to town fairly quickly. My bottled stuff tastes good, and the Red Ale I racked to secondary this weekend tasted great. Just did a stout also with dry, though I used extra yeast (1 xtra packet) and made a bigger proof. The 3 batches that I have made are basically my 3 favorites (pale ale, red ale, stout), so I am thinking that I might remake all of them exactly the same, except for using liquid yeast instead of dry. Then I will know if it is worth it to me. I think, overall, that this might be entirely a personal preference.