Product review (5 stars): You need to try this.  Rosewill's the brand I chose.  Read on...
Did not buy this via amazon
Let me give you the cons first-
When you get up to/around 1g of water, if you have gas, you might be better going that route
If your electricity is out, this obviously won't work

Other than that, you should own one of these.  You should absolutely consider going beyond one of these and converting your entire cooktop to induction.  I have a gas grill with a cooktop on the side, so I'm considering.
PHENOMENAL product.  This is like the 20 minute cookbook for parents times 40.  This thing will boil 6 cups of water, cook that for 10 minutes, then brown ground beef, then combine in easily under 30 minutes.
Why DON'T you own one of these yet?
I went Rosewill bc their website appeared more conducive to customer service.  Mine has had no issues so I cannot comment on their level of customer service.  I can tell you I could FIND their CS more simply than the other brands out there, so I went with them.

This was a under $60 test and so far I am sold.  Obviously full-blown induction cooktops will put out more wattage than this countertop-plug-in-the-wall job.