I added a 171 Echo Star Roadrunner to my bag in late May after losing my Star RR. Brand new the Echo flew much like my seasoned Star and it hasn't changed much since. Primarily used for shots that start hyzer, flip past flat, and end right in the 325'-375' range. Powered down a little below that, it goes pretty straight. Powered up more than that, it requires more hyzer and room to work than I'm comfortable giving it on most tight tunnels.
I've thrown E* Teebirds and Leos that were more stable than their normal Star counterparts but the Echo Roadrunner I picked up doesn't follow that pattern. FWIW I looked for one with a moderate dome and a medium PLH.