We bought a swing set from Lifetime a few years ago (it was wonderful too) so when we needed a small shed, there wasn't a question as to where we would buy it.  Lifetime products have the best, easy to understand, instructions that I have ever seen.  And, the way they package parts in separate bags for each step makes it easy to identify what you need. I almost finished putting the shed together today.  I spent about 3 hours 2 days ago completing preliminary installation and then my son (age 34) and I put it together after he got off work tonight.  It took us 4 hours and we're almost done.  Just have the door latches to install and anchor the shed to its concrete pad.
We do have 1 issue yet to figure out. On the installation of the skylight we can't get the two end pieces to fit quite right yet, so I'll try to figure that out tomorrow or call their support if needed.
Overall, I'm very satisfied with this shed.