These are about as perfect as it gets
579801
These are about as perfect as it gets. The price was right and they fit all Legos. Not to mention they're more sturdy bases than most Lego bases.
2545401
You will be hard pressed to find anything wrong with these lights.  I know there is no such thing as perfection but these little gems are about as close as it gets.  Perfect size.  Easy to operate.  Light weight.  Accurate lumen rating as they are very bright.  You can adjust the amount of light that you want.  Hang them up in your tent, inside your car, at your camp site, or any other source.  Because they are so light weight they will remain at the light level you want.  The handles are perfect for doing this. Plus, I like the various color options.  Thank you for making such a wonderful product. I might just have to buy more!
4438709
These are super, as handy as a pocket on a shirt.
2513091
they work like a charm, definitely not too low or too high
3179736
these are of a somewhat higher quality than most, for only a few more bucks
1992119
I like these so well I ordered a second set.
2168948
Every bit as good as ones costing twice as much.
534059
you might as well just buy these now instead of wasting your time on cheap crap. Trust me you will be buying these or at least ones that cost around the same later On anyways
1910697
You won't be disappointed. These have come in super handy. 50 seems like a lot, and it is, but I'll probably be getting more soon.
4050778
These are brilliant. Now, that said, they are not perfect, but after having them now for 6 years or so, they have made my bike a far more effective option when headed out for some groceries, etc. Mounting hardware is okay, though not universal; your bike and frame/rack may require a re-thinking of bolt length, using stainless hose clamps, or similar solution to make for the best fit. As others have mentioned, they will rust a bit in some areas over time, so keep a bit of lithium grease or similar in the hinges and on the clasps. And yes, the clasps that hold them shut are often difficult to open; keep the lips of those greased a wee bit as well. Folded, they are totally out of the way, and opened, they are quite robust and accommodate a full-sized shopping bag exactly. I have ordered them again for my wife's new bike, and will when I replace this bike in a few months. A fine design generally and with sensible adjustments to fit your own specirfic arrangements, they are a trememdous addition to your bike's capabilties.
4616936
I was worried that these wouldn't fit well, but they were perfect. Nothing is as sweet as quickly flipping your thumbs up and popping the lids. Do yourself a favor and get these.
4007851
Just came here to say if you can catch these on sale like I did, don't hesitate to buy them.
1120178
These are about as good as it gets, as far as a regular type 9004 bulb goes, while keeping the price tag within reason. Worth it.
1874185
Seriously, this is nearly perfect.  If you or someone you know, likes Reese's peanut butter cups, then this is a winner.

Cut into horizontal strips, and the proportions are nearly perfect.
3388572
These are amazing. Exactly what I was looking for.
3435594
NOt perfect optically, BUT, since I bought these two years ago, I've had a blast with them.  I take these to all star parties now instead of my 10 inch telescope which is gathering dust, believe it or not.  Other people love them as much as I do.  I use them on a nice sturdy tripod and certain wide-field objects are unbelievable in them.  I can find about anything with them, a love amazing people with what I can find with them (yep, I know where all the good stuff is up above, and that is really key to getting the most out of any binocular or telescope).

Large diffuse objects like the Pleiades , Andromeda Galaxy, Orion Nebula, Perseus Double Cluster and Comet PAN STARRS and more are drop-dead higher contrast show-stoppers with these.
1759270
I've used these before, and they are excellent.