From Ashes is definitely worth getting; however, it is kinda overpriced. The mission is provides is really, really weak gameplay wise. You're pretty much just paying 10$ for the character and the amount of extra story and dialogue he brings. He is a great teammate at least - he's the only other person I use aside from Liara and Garrus.
I made the dumb decision of not getting the special edition that came with the DLC (plus the other minor content) already. I knew I wanted to get the "prothean dlc" but I didn't do my homework beforehand and look to see what the special edition (or whatever it is called) even came with. Oh well.