Its convenient and fast, I feel. I like the interface too. Quite user friendly. Easy to grab the links to the photos as well.
The only drawback is that I cannot arrange the photos in the photostream unless I manipulate the dates on the photos.
However, this can be remedied when you organize your photos into sets.
Its kinda expensive too, on hindsight. Haha.. But ok la.. Since I had already uploaded and placed links to many photos n Flickr, I decided to upgrade to Flickr pro. 24 + per year I think.
How much storage space you have is based on how much space your HDD have and how you configure it. You can load in 2x 3TB and get total of 6TB or do a RAID1 to have a duplicated 3TB. i.e. you only have 3TB space but your files are saved to both HDD.
It can also be configured to access through a web browser anywhere. The only limitation you have is your internet connection speed at home.