Amazingly simple to assemble- Directions are spot on.. just make sure you read the entire process once before you begin, and then follow each step.
I managed to get 75% of the shed up on my own in about 4 hours- then had my girlfriend help me for the roof. Took about 6-7 hours all together- would have been much quicker with 3 people (2 assembling, 1 reading instructions).

Everything lines up perfectly with hardly any effort. The shelves that are included are great, skylights and window are a nice touch. 
Looks great, hasn't leaked so far- and I have no reason to believe I won't be satisfied!