Product review (5 stars): 90% dry, 100% happy
I love this little machine.  I started doing laundry by hand because our local laundromat solutions are expensive and gross.  But dripping wet laundry is no good, it takes forever to dry and makes a mess wherever it's hanging!

Enter the Nina.

After I soap up the clothes, I put them in the Nina to extract soapy water, back into the bucket for a rinse, and then back into the Nina to spin dry for about 5 minutes.  When I take the clothes out, synthetics are almost completely dry (about an hour left to air-dry) and cottons are pretty dry (about 4 hours left to air-dry).  Obviously, your mileage may very depending on humidity, temperature, and airflow, as well as the individual properties of your clothes.  I have a cold apartment with poor airflow, so I use a box fan with my drying rack to accelerate the process.

Pros:

It's not terribly noisy.  It's a little louder than a fan.

It is fairly big.  It has the footprint of a 5 gallon bucket and is about 150% as tall.  I can squeeze it under my cabinetless bathroom sink though!

It is not very heavy.  Anyone with a normal amount of strength can move this thing.  It even comes with a handle for easy hauling.

It can fit a good amount.  I just took a load out:  2 women's M tees, 1 women's M yoga pants, 3 men's XL tees, 1 men's XL button-down, 1 men's XL long PJ pants, and 2 pairs boxers.  I do my laundry in a 5 gallon bucket and leave a little room for sloshing.

It's pretty good at self-regulating loads.  Once it's up to speed, it works very smoothly!  If it's still knocking 10 seconds in, you may need to shuffle the clothes around and try again.

It's very simple to use.  If it's plugged in and you close the lid, it starts spinning.  Open the lid, and it stops again.  Just don't forget and close the lid when you don't want it to spin.

The cord is conveniently long, but not too long.  It has built-in cord prongs on the back if the cord is too long for your needs.

Cons:

Clothes don't come out completely dry, but they're not supposed to!  If your shower rod is sturdy, you can hang things there; otherwise, you will want a rack, line, or something to maximize surface-area-to-air of your clothes.  The good news is that clothes do not drip after coming out of this, so hang them wherever you want!

It's accented in pink, which makes it look like a toy.  (Then again, my bathroom is salmon pink, so it matches nicely.)

The safety plate is hard to wrestle in sometimes.  You don't always need it, but I find it makes my loads more stable - and after finding clothing starting to spill over the drum, I always use it!

It didn't come with a bucket.  I'm using an old popcorn bowl.  Seems like a silly thing to leave out.

It drains whether or not you want it to.  Keep an old towel around just in case you need to dump your water catcher halfway through a load - a stream will still trickle out of the machine.

I would not recommend this dryer to people with a conventional washer that has a good spin cycle - you won't see benefits.  However, I highly recommend it to people who use an unconventional washing method (the mini washers, handwashing, bucket laundry, etc) because it will make your drying life much better!