So far so good. I like being able to blog while having nothing other than my phone. What separates this from the crippled workarounds prior (such as emailing to a specific address) us like night and day.
Essentially you were blogging blind before and not sure how the final post would look. Tagging and categorizing are easy. Also with the ability to place photos into the posting either by your photo library or snapping a pic within the app allow impule blogging from your pocket.
The most important element is the ability to preview the post before publishing.
UPDATE: Something I do wish for a future update is the ability to place or resize picture(s) within the post.
an option to set the automatic image scaling would be great. i don’t like having a 640×480 zoom image. but so far so good.