I bought this on a whim when I wanted to make a soup that needed to be pureed. It pureed it like a dream, very quickly--whole cloves of garlic vanished. It was much more convenient than putting HOT soup in a blender, small quantities at a time. What a mess that made!
Whether or not this is a worthwhile purchase for you really depends on your needs in your kitchen.
That being said, here are a few thoughts:
1. It's a little bit heard to clean the underside of the blade by hand. Probably the best way would be to immerse it in hot soapy water and blend. I personally prefer cleaning things like this immediately rather than putting it in the dishwasher, but it certainly is dishwasher-safe.
2. No ON switch, just pulse. But I find that preferable, as the pulse switch is located on the grip, and considering the sharpness of the blades, it's a good safety feature.
3. Power levels go up to 9, but I find the lower setting to generally be sufficient. When the setting is too high, the blades create a powerful suction with the bottom of the container. This can grow annoying at times.
4. This doesn't replace a blender nor does it replace a handmixer. If you make shakes or smoothies, soups, or other foods requiring puree, and find your blender for some of these to be cumbersome, this product may be something to consider.
5. The cup it comes with seemed really handy when I opened the box, but so far I've used it for nothing more than a holding container for the appliance on my counter top.