Are HS81 servos a good replacment? Will there be a weight diffrenece? And if so how will it affect it's flight capabillites?

Been using HS55's.

I have an hs81 on my elevator and it works just fine. I plan on replacing the others w this servo even though I haven't had any problems w stock ones. Any weight difference is too small to notice. I love the Typhoon! It rox!