Upload & Sell: Off
I'm a student, and I shoot photos for our campus newspaper. I use Squarespace for my personal blog and photo galleries.
You can see the site here: boanderson.com
I'm not seriously trying to sell prints or book clients. Its more of a place for me to showcase my images for friends and family. With that being said, here are some Pros and Cons over my time using Squarespace.
Squarespace is easy to set up. A lot of their templates (especially the new Version 6 ones) are geared towards photography portfolios.
The images look stunning, and you can add images or galleries to blog posts.
You can also easily import an old blog. Importing my wordpress blog took about ten minutes. All images and tags were intact.
This may be my own problem with image size, but the images on my main page can take a long time to load. It has been tough for me to find the balance between high quality images and quick loading pages.
Right-click protection is not enabled by default. However, you can use the code library to add the protection in.
If you have any deeper questions, feel free to ask.