I'm just over 6' tall with long legs and ride a 2011 EC 300 and I am very comfortable on the chassis. I have never tried a 12 or 13 but would sure like too!!
When I first got mine it took me awhile to sort the jetting out and it never had the power I thought it should have either. Now that it is jetted properly it runs awesome!! Strong power throughout and just last week I took out the slop in the power valve and HOLY SH!$&":;!!!! It now flat out rips!!!
I would say spend a bit of time to get it dialed in and I think you will be very happy with how the motor will perform!
