Hey HungNtree,
I think you'll find you love fishing with a dropper. I use it nearly all the time. As others have mentioned, the biggest drawback is turning your line into a bird's nest. To avoid this, slow down your casting stroke to open up your curves. No tight curves on the cast. Slower rods are easier for this. If you cast a strong tight curve you might hear the popping sound of your dropper snapping off!
For your first few outings, you might stay with a maximum of 18" for the dropper. That will still provide a choice for the fish, but limit the hazard of tangles. Also, don't try it for the first time on a windy day. A brisk side wind can be disaster.
And finally, I usually drop the tippet on the dropper down a size. My thinking is if I hang up on a rock or stick, I'd rather lose one fly than two.
Let us know how it goes for you.
Rex