I use Photobucket, never had any problems except a little slow performance uploading photos from my home Internet connection, but I use a DSL connection with a relatively low rate.
It took me 8 years to use up the free space, and then I bit the bullet and took the basic storage package, it's 50 meg, for $49 per year.
The only other problem I have is not with Photobucket, but with our web filter here at work. It interferes with the process of viewing some images. For example, I can't see some images in posts here, that are linked to PB, but when I'm outside our network, at home, for example, the link completes without problems. But that's not a Photobucket issue.