I love my Helios but my tail motor definitely is sluggish compared to my v911's. much slower piros. I even mentioned it in my initial observations after I got it. Could be just mine of course. I do have to say though I really love the helios and the more I fly it & get used to it the more I like it! For me it's approaching my v911 love.
Definitely my second fave & rapidly approaching equal status