Good for revving up old machines.
587070
Works great in a Powerbook G4 to put in a much bigger and faster SSD in rather than installing an old and slow 320GB PATA drive. While you can only go as fast as the bandwidth of the old PATA connection, it does make an improved snappiness on launching apps and brings some new life into an old machine.
2818418
Nice, works good. Looks decent not like those cheap plastic white or black fans. Retro style antique look.
4166480
Good parts, arrived as expected.  Includes both the old design seal and the new style as well.
Make note there is no small squeeze tube of moly grease, so have applicable grease on hand for assembly and coating the shaft to reduce future corrosion. There are printed instructions that can supplement online videos before you dive in.
Good parts for the price to keep older machines running.
1704947
It works great.  Better than my upright that died.  Good for those small jobs that happen.
1306653
Used in old Self Propelled WindTunnel with bag.  I change them frequently since they get dirty from normal weekly use.
4362554
I bought this to replace an old Campbell-Hausefeld compressor that gave up the ghost after about twenty years of occasional use. I was so used to the noisy compressor that I had no idea how good these things have gotten since the time I bought my old but reliable unit.

I used this on a large Tacoma tire to "top off" some air that leaked due to a nail puncture. I also used it on the tires for two bicycles. It worked reasonably fast but what surprised me was how little noise this unit makes.  For my purposes this will work just fine.  If you have to do a frequent large capacity tires or something similar you may want to go to a larger volume but for emergency and occasional use this little compressor is impressive.

I did buy the adaptor for direct battery connection just in case I wanted to do a heavy duty job and I did not want to burn out the cigarette lighter fuse as some of the comments indicate happens on occasion.
626756
Worked great for my application - sometimes "old school" is more efficient than the new technology - and cheaper too.
2986593
Have been running these for a couple years on my wife's bike, and recently put them on my own. While they don't seem to have the lifespan of something like an Avid G3 rotor or anything like that, they work well, are usually pretty quiet, and stop remarkably well. Plus, they're lighter than most anything that isn't ridiculously expensive. I find it easier to keep a supply of these on hand and just swap them out whenever they need it. My buddy then uses the used ones in his welding art, which works well because they look cool. :D
2998158
Motor fit perfect for an old 80's fan. Replace all three in my house. Did have reverse them though.
3784414
Works well, good power only drawback handles seem a little inadequate for such a heavy machine.
3417476
I use these to clean machines with air, fuel, & oil passages.  They work great!  They are just like the good old cleaners, with a stiff bristle wound through material...works great!
1708083
I replaced the 20+ year old fan motor in one of my bathrooms after the original started making noises. It is much quieter than the old motor. I did reuse the old blower wheel because the new wheel seemed to be slightly out of balance.
3583608
It does the job I bought it for.  There is a little learning curve as there is with any new machine.
3872660
not to bad for a small machine,it work pretty good for my truck, the other half needs to be convienced
648901
I have a really old Briggs and Stratton 3.5HP engine for my lawnmower that I had neglected for some time. After doing all the necessary tune-ups, the spark plug really makes the engine run like new.

Can't say more than that. It does what it does well.
872889
I use it to lubricate my fan motor bearing.  it works as expected freeing the motor.  I can now keep the fan instead of buying. A new one.
2715411
This product is used to clean my vintage sewing machines of built on dirt and goop and heavy oil build up.