That board looks like it is decent shape, $200 is an okay price, however I'm not sure that is the right board for you.
A board that is easy to paddle will not be easy to duckdive and vice versa. Compared to your current 7' funboard that board will be easier to duckdive but harder to paddle. It will be harder to catch waves with, you will need bigger, hollower, more critical waves than your funboard. It will need to be pumped over flat/weak sections, it won't glide or trim as fast as your funboard. It will be less stable on pop-up and turning. If you can't do carving turns now, then switching to that board will actually hamper your progression. If you can bottom turn, top turn, cut-back, pump for speed riding on your frontside and backside and if you can catch more than half the waves you paddle for on your funboard, then go ahead and get the board, you should be ready.
This is a good video below to understand the difference between trimming and carving turns and what you can do to improve your carving turns:
If you want to get a board that will help you improve your carving turns you should get a 7'-8'mini-mal or a 9' all-rounder or 9' performance longboard.