If you've been on the fence about trying it out, there has never been a better time. While the free accounts have their restrictions, you can still experience 90% of the game at no cost...including no level caps (minimum levels are required to leave starting areas and enter WvW). Yep, you can play and level a toon all the way up to the max level of 80.
And down the road if you choose to purchase the Heart of Thorns expansion...your existing account gets upgraded/unlocked. So no starting over!
So if you've ever been curious about it, feel "free" to check it out.