First of all, the reviewers who said these brushes ...
340187
First of all, the reviewers who said these brushes are loud are spot on. They are! But, they are also very effective in cleaning teeth without being too harsh. They clean as well as highly-rated rechargeable electric tooth brushes I've had in the past and with far less spattering. For the price, they can't be beat as long as you don't mind the noise.
2699829
Yep, they are brushes... with a bit of IPA they can help to remove unwanted flux residue etc. They do the job for me.
743221
I got these to paint small areas. Well besides the hair coming out I cant get the hair to stay together they separate so what good are they. Too lazy to send back. I had a feeling when they were so cheap. Do not buy cheap brushes.
3552379
Only reason I gave 1 star is because I couldn't leave 0 stars. These brushes are horrible. Ordered them to check them out...as a possible slightly less expensive option to the Winsor and Newton Series 7. Well...they are less expensive. That's where it stops. These brushes came with the most ridiculous excuse for a tip I've ever seen. I honestly think that the tips on the dollar store brushes my kids paint with are better. There was absolutely no point to them. No paint retention...as soon as the brush touched the surface all the paint was released, the bristles splayed out like a camel toe...what bristles there were. The ends of these brushes reminded me somehow of the tip of a dog's tail that is suffering from a terrible case of mange. The description claims they are Kolinsky Sable hair...and maybe they are. But I'm pretty sure that the hairs used to make these brushes were the rejects from W&N after they fell to the floor and got walked on for a couple weeks. W.A. Portman came to the Winsor & Newton factory and swept the floors and used whatever hair they could salvage from the piles of dirt they collected to make their brushes. Just a complete waste of money and time.
456346
Brushes work as described by seller, and I'm buying more in different sizes. I had better results using a corded drill (as others have noted). Product seems expensive (also noted by others), and they are not as durable as I would have hoped, for the price I paid. Perhaps I'm wearing them out more quickly by using the more powerful drill. Bottom line -- I'm happy with the product and will probably replace the brushes as they wear out.
1103225
These are awful. I have no idea why or how they're this highly rated on amazon and now they've even increased the price from $2 to $6! That's absurd. They shed like crazy and it's so hard to get all the hairs out. Then, if you happen to make the mistake of using baby oil or solvent to clean them, they shed even more to a point where they become unusable. I hate these brushes so much, and am now willing to pay ten times more just to find one good brush to replace the dozen of these that I bought based on a recommendation from a great artist I follow.
618686
Read the reviews and they said these were good, however they were not what I expected and poor quality. Even though I use them with students the brush collected more paint on it versus the object they are painting
663928
False advertising does nothing more than a regular brush does
2015491
The brushes started coming apart the first time I used them, I ended up putting tape around them to hold them together just to get me through one night.
4952700
I'm enjoying my brushes . They are good brushes for what I'm using them for.
4004751
I have not used the brushes yet but I can tell everyone interested they look good, some of the bristles feel hard but they were shaped before packing them. I have looked at all the arts and craft stores and these are by far the best I have looked at. The price is much better than the stores. I will post a follow-up when I use them.
822049
I like the brushes, but the photo is deceiving.  You do not get all those kinds of brushes.  I should have read the info more closely.  I assumed, from the photo that I would be receiving those.
4612247
I am a miniature painter . Those brushes are just ok . You CANT compare then to a Zembrush or Rosemary Co . They are cheaper and well assembled but they won't give you the pointed tip you need/want/deserve . So I can only recommend them if you are in a budget or need some brushes to spare , to mix paints , etc ...
4813309
Nah, don't hold up for long; not too effective. There's a snap-in brush that does a much better job.
4790122
When I pulled these out of the package, the bristles of the flat brushes were as hard as a rock like they'd been used in some sort of clear lacquer and left to dry without being rinsed out. I was able to rinse out most of it but am a little uneasy about whatever that was since the brushes were made in china.. Would purchase a different set instead.
4031531
Needed basting brushes, they seem to work pretty well.
4704451
I purchased these when I bought my Roomba, and unfortunately never had to try them until recently.  I get an error message when the Roomba tries to run saying the brushes are jammed.  I put the old ones back in after I dug them out of the trash and they work just fine.  Not recommended.