The original Helium proto 5F4 that I received from Danny 5 years ago is definitely a top contender for my Speed. Something interesting about the Speed to me is that shaft changes seem to really change the feel but maybe I just center it less often with the iM10 and the HZRDUS hulk green shafts. Accra TZ6 also doesn't feel as harsh as the Smoke's when it comes to impact feedback.