The great ventilation does necessitate the use of a liner when it's wet out as the channels put up no defence against heavy rain. The lack of a chin strap pad combined with the tightness needed in the straps meant that it wasn't as comfortable as it could have been under my chin.
The elasticated fitting system at the back of the head was adjusted with velcro, and the 'give' in the elastic, while more comfortable than the usual plastic ratchet or dial, did feel less secure than my other lids.