I flew over it twice. Wasn't too bad. There was a bit of weather at altitude but it tended to be in bands that could be easily avoided. I belted everyone up but the turbulence was light. To be honest I have found most typhoons are fine at altitude ( wholly different beast at lower levels). I find running into the thick continuous line of huge CBs of the ITCZ much more daunting. The ITCZ gets treated with the utmost respect.