I love it! This is the kind of thing that makes a great novelty gift for gift exchanges, but can also be extremely useful in the hands of the right person. People who use sugar in their tea or coffee will get a kick out of this for sure, but I have a very different use for it. I have to take protein shakes due to a health issue, but I hate how the drink gets all gunky and thick when you leave it sitting for more than five seconds, meaning I'd have to constantly stir and stir, but with this, my protein drink is kept lovely and smooth.

If you're using this with a thick drink, it does take a minute to get up to full speed and do the 'swirl', but the plastic fan churns the drink too and makes it ultimately smoother, which is something I really enjoyed. There are some things you should note if you're thinking about buying this:

1. The mug is a little smaller than it seems, since the bottom half is taken up with the battery compartment and motor. The actual interior size is equivalent to a regular sized mug (as opposed to a travel mug which it resembles from the outside).

2. DO NOT SUBMERGE. This product is hand wash only, but it's not waterproof, so to wash just fill with with water and some soap, use the battery 'swirl' to clean it, empty it and wipe carefully over the outside and lip with a damp sponge. Be careful not to drench the bottom with water or run water against it as you risk getting the batteries wet!

Noise-wise, it's surprisingly not that loud at all, but BE AWARE, if you run the 'stir' button when there is nothing in the mug it is very shrill and loud and could hurt your ears However, when filled with liquid it isn't loud or painful at all.

I was really impressed by how smooth and contained the stirring was, with no splashes or risk of spilling. It also comes with a 'travel mug' style cap so you can take it on the go. I'm going to continue to use this daily for my protein shakes!

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Pros:
+ Nice colour options.
+ Doesn't splash or throw out the liquid, creates a nice smooth 'whirlpool' stir.
+ Works with thicker liquid, though it does take a minute or so to stir it fully.
+ Not too noisy once the liquid is in it.
+ Fun to use and helpful for those who like a constantly stirred drink.
+ Great for tea, coffee or even milkshakes and health drinks.

Cons:
- Fan motion is very shrill and loud when mug is empty.
- Must be careful not to get water into the battery compartment.

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Note: I received this product at a discounted rate in exchange for an unbiased, honest review as provided here. As a consumer advocate, I believe in providing quality and honest feedback and receiving a product at a discounted rate will never affect my opinions.