Worked for my four year old
921580
I wanted to write this since the majority of reviews for Thum are negative.  My four year old daughter (who has always sucked her thumb) had recently started sucking her thumb raw, so it was cracked and red. I paid $7 for this at the local pharmacy and was surprised because I didn't think it tasted very bad and didn't think it would work as a deterrent.  A minute after we first applied it, I heard her say "Ew!"  I asked what was wrong and she said it tasted spicy.  She has always been a picky eater, so maybe her taste buds are more sensitive than mine.  She has not sucked her Thumb since, so it really worked for our situation.
379158
I was worried about it being too small for my 4-year old but it is just fine.  She has sensitive ears so I was also afraid of the metal because it's fairly inexpensive.  She hasn't had any bad reaction to it.
3886389
It worked really well until my 6yr old got a hold of it. Overall I would buy this item again.
3569873
My four year old daughter and I read this story together. Admittedly it was a bit long and she struggled to stay attentive the whole time, but she enjoyed it nonetheless. The characters personalities match their names, which was great to help her understand different types of feelings. The story is fairly engaging and best for kids around 5 or 6 I'd say.
Disclaimer: This product was received at a discounted rate in exchange for a honest and unbiased review.
3112876
Easy enough for my 4 year old to do. It's study and hold up when he plays with it fully assembled.
4138873
These work for a 4 year old really is great. I love that she can not turn the volume up to the degree she can not hear. Also the price was teriffic!
3315113
This worked well for a five year old, and teenagers/adults.
1137228
I was looking for headphones for my 1 year old to wear to watch DVDs on the plane. They worked and fit great. He does have a big head- always 99% but I think it'd fit a normal sized head for a 1 year old! The ONLY thing that I didn't like is the volume control on the wire- I was worried he's push the volume all the way up and blast it too loud, but if you're kid is older and knows better you don't have to worry about that :)
4751854
I bought these for my 4 year old who just got a new pair of glasses that didn't come with a strap. These suction cupped on the back of the glasses well and I like that they are a little stretchy but not too much. He can pull them over his head without much problem but even at 4 years old (and a tiny head) they are a little tight. They don't adjust and I fear in the next year, they may be too tight. It's a do-able solution at this price though. Comes with a lot of goodies too like ear pieces and a nose pad which we didn't use but they are handy.
1057077
My son had just turned two and would poop in the potty, but not urinate.  I decided to try it (my husband was in charge of my daughter for the whole weekend) and adapted the book to my son's personality and what would work for him.  It was a very long Saturday with 3 accidents.  Then Sunday morning after one accident it finally clicked (practicing going to the potty after the accident was what made it click).  This may not work for all children, but it worked for my son!
3322828
Our son was always trying to take pictures with our camera but had a hard time trying to hold it.  It wasn't something we encouraged at all since we have a large expensive camera.  We wanted to get him his own since he was interested in taking photos and wanted something that could last a while.  After reading up on several different kid's cameras, we decided on this one.
Pros:
*takes good photos, not great but fine for a 4 year old to practice with
*has some neat features like the option to add several different frames on the photos while you are taking them
*games - my son loves the games that come on the camera and they have entertained him on car rides
*easy to use and hold for small hands
*durable - has been dropped several times and works just fine and shows no evidence of being dropped or banged

Just an FYI - the camera runs on 4 AA batteries.  Not sure why but we assumed it was probably rechargeable like our other camera so we plugged it into the computer and it seemed to come to life.  Well when we unplugged it, we realized it wasn't working.  Unscrewed the bottom and found it runs on AA batteries.

My son has had this since Christmas 2010 and he still loves it 4 months later.  He plays with it daily and has taken several photos of family members, the wall, his feet and close ups of the furniture.  He is getting the feel of holding a camera steady and aiming at his subject to get it in the photo.

We are really happy with this camera and highly recommend it for kids.
4520469
Bought this for my 4 year old almost 5 year old.  Im a ham radio operator love electronics want to get my kiddo interested in hobbys and building things.  I read the directions have him help me put in the wires.  Tonight we made the 2 transistor am radio, am crystal radio, and police siren.  Pretty basic easy to follow directions
512529
I have four kids: ages 3-8, so we were right in the target range of this reading program.  For your money you get access to a 1 year subscription to their reading activities.  You can run it off just about anything (PC, Mac, tablet) but we stuck to a good old fashioned PC.

Our kids have just started on this and they are (so far) interested and engaged.  Your typical 3 year old is going to need help with this, but beyond that most kids can handle this pretty well.  Our 7 year old is a really strong reader and he isn't getting much out of it, but I can see where this would have helped his older brother a lot when he was younger.  Regardless of whether they are learning anything, all my kids like to play with it.  I think the "optimal" age for this is 4-6.  Old enough to be comfortable following along with the rules and with enough attention span to follow through with it.

There are a ton of activities, so I can see it being worth the price.  Still as a yearly price it's not cheap, and it's not obvious looking at this page that you are only buying a subscription.  This package also includes a story book but I'm not sure it's worth the extra $20.

Overall a good product and certainly a far better use of screen time than just sitting in front of a TV.  If you've got a 4-6 year old who's not that driven to read this might help get them jump started.  If you've got a 7 year old who is struggling with reading, by all means try this out.  If your child is already a strong reader I'm not sure you are going to get a lot out of this, but again, there are worse ways they could be spending their time.
2371201
This worked great for my toddler. She was potty trained in 1 day like the book advertises. She only has an accident now when she gets so involved in her playing she doesn't listen to her body. So when she's playing for a while and I know it's been a couple hours since she's pottied if I remind her she goes and is accident free.
1055334
This suspenders/bow tie set looks nice and it certainly did the job. When pulled on by my 4 year old after the ceremony, the bow tie did pop off and it seems like it would be a challenge to repair it. Also - the suspenders seem small in contrast to the neck that the bow tie might fit. My 48" tall 4 year old almost maxed out the size of the suspenders. They did work for what we needed and did make it thru the formal part of the wedding he was in - so for the price it was right for us.
4811703
Our son was struggling to brush his teeth longer than about 10 seconds unless we were brushing them for him. Hes 4 and completely capable. So we bought this timer so he knows which buttons to push, either the tooth or the hand. It works  great. The only thing that I took a star off for is that the tooth timer is really long for a four year old. I know its whats recommended from dentists but it still seems to take forever.
4121466
It is a little small, and their necks still get a bit bent over. But they kids will wear them and it's still an improvement to having no neck pillow.  I feel like the 4 yr old doesn't cry quite as hard when waking up from a snooze in the car when wearing this versus falling asleep without the neck pillow.  Fits both a  recently turned 2 year old and recently turned 4 year old.