Due To cm changing stuff flashing any of the twrps and then flashing a cm based ROM will end an a error I will have to update it once I get some time
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You'll need to get TWRP 2.7.0.8 from here if you want to keep TWRP when flashing CM11 built after 4/30.
http://wiki.cyanogenmod.org/w/HTC_fstab_updates
I did try it out in place of the non-touch CWM in the zip. Works great!