I got my Sonic Blade in August and have loved it since! I am a baker, and can't get over how it makes a perfect display of my breads while other knives smash delicate items. I have not tried to cut frozen food yet, but it made an easy and appetizing way to serve our Thanksgiving turkey. My favorite use is pineapple coring- it slices through the rind with ease and makes the process MUCH faster/ less tiring than using a regular knife.
I've used it at least two times a week for six months and always machine wash. I also participate in a revolving dinner group and often pack it up for the host's use if I know they do not have one (although several have purchased after using mine). Through all of this, it has held up beautifully. I'm disappointed some reviewers have mentioned broken parts; this has not been my experience at all. I'll update my review if anything changes!