I played it when it 1st came out. Legendary status with all classes stories completed.
The free to play is very limited. You only get 1 or 2 chr, limited strikes, limited PVP matches, limited credits. Any extra credits get stored. But you get to play the whole story campaign.
If you're a star wars fan I recommended. Its pretty balanced the Jedis and Siths aren't better than the troopers/smugglers/Emperial Agents.
I recommend playing the Agent class if you want the best campaign. It is what you expect from a spy/espionage type story
It also lets you download the bare minimum to get started on the opening worlds. By the time you finish the download will be complete in the background