I got one of these a few years ago when I was desperate for a space heater that wouldn't blow the 15 Amp circuit that ran 3.5 of the 4 bedrooms in the creaky 1905 house I was renting with roommates. It really saved my bacon. It can get one 12' x 12' room from 10C to 19C. It's easy to schlep around, and when the rest of the room is freezing you can rest your feet on it. It's perfectly quiet and economical. It's easy to wipe clean if something spills on it or if it gets dusty.

Like a pioneer woman using every bit of the thing, I also found the box it came in made a great desk/table for when I'm sitting on my bed and want a glass of water right to hand.

I'm docking it one star because after three years, one of the little plastic feet it rests on cracked through the center and broke into two pieces. I could still prop it up on the remains of that foot and the other foot, but I did worry a bit about doing bad things to the carpet. Still, I like this heater well enough to want to carve or cast another foot for it someday.

The personal heaters I've tried over the years have been noisy, tripped circuit breakers and often gave off burning smells that made me wonder if they were even safe. After trying a large-sized oil-filled radiant heater at home, I wished I could find a smaller version to sit by my desk at work. With some research online, I found the Newair AH-400. It was just what I wanted - a radiant-style heater small enough for my workspace. I ordered it hoping it would keep my legs warm at work without causing power problems among the computer equipment. After a month or so of use, I am very pleased. It fits my needs perfectly. My experience with ordering and shipping was good as well. Everything was prompt and correct.

I bought this as a xmass gift for my wife. I was a little concerned with the dimensions listed thought it would be to wide, but it did fit under her desk. She loves it, not only keeps her feet warm but even when the room is cold she is comfortable.

I had been thinking about one of those radiant underdesk panels but after reading the reviews decided those wouldn't be enough for a climate like ours (Wyoming). This unit works very well.

I was looking for a heater that would fit under my desk, and provide slow comfortable heat without popping the circuit breaker. This is an excellent heater for an office or other small area.
The heater is rated at 400W. I tested the current draw a few times by plugging the heater and my computer into the same outlet strip, and turning them on simultaneously. No problems - the circuit never tripped (of course in actual use the heater should be plugged into a wall outlet).
When used under a table or desk, I've had to turn it down to near it's minimum setting. It provides enough local heat that I can turn the main furnace down 2-3 degrees. For the cost of a 40-watt light bulb, I can work in comfort!
Although it doesn't get as hot as a fan heater, like other oil heaters it is sometimes too hot to comfortably touch. Be aware if there are toddlers or flammables nearby.
The product page is sketchy on details; heater dimensions are approx. 21.5"L x 15.5 "H. Width ranges from 0.5" at the fins to a 5.25" W at the base. Weight is just under 7 pounds.