I love the concept of it and it is absolutely easy however the plastic top where you would drink from is a real pain in the neck to open once snapped shut.   I called and talked to one of your reps who said I needed to 'break it in'.   Unacceptable answer as I cannot use a lid simply because I can't open it once shut.  It is soooo tight.  Not happy about this feature AT ALL.  Love my Vitamix but his is just unacceptable