8' is a good size for learning on. My first board was an 8-footer from Lost... Pretty sweet, and at 8' it is fairly easy to balance and control.
I don't know anything about that particular board, but check for dings and cracks in all the firberglass before purchasing, and having 3 fins is easier to control than a single fin.
Have fun and be careful. Big sets can be a lot more tiring than you think...
And don't be afraid to ride "re-forms" if the waves are bigger than you want to deal with while learning. Learning on small, reformed swells will be easier and less dangerous than trying to ride bigger waves as they come in.