It may seem silly but dropper posts are so worth the $$! this particular dropper is great. It runs on a hydraulic system and the handlebar lever is light action. Once you get a dropper post you will never go back.
A dropper post is totally worth the investment, whether it's external or internal. This one works exactly as I'd hoped, and it doesn't add a ton of weight to my frame. The 125mm gives me a perfect range to work with for descending/climbing, and the actuation is responsive every time.