Does not work well with braided line
588299
I tried this reel with yellow braided line.  The drum attracted and started to build up with the coating / coloring of the line.  This stopped the reel from casting more than 60 feet reliably.  I have had to take it apart and clean the drum over and over hoping that the problem will eventually work itself out.  Little luck so far.  Seems this reel was only tested with the mono line that comes with it.  Spare yourself the headache.
2894818
Stitching of braids was loose and overlapped and staring to separate. Picture shows two feathers, mine came with one so I modified it by gluing and trimming ends of braids and purchased more feathers. Just in time for Octoberfest.
3534649
This product fit onto the spool and it somewhat worked. It is very stiff and difficult to wrap onto the spool. It did work with my model but as it unwound while cutting, it did not straighten out and kept curling up under the spool and getting stuck. So much so, that every time, I had to remove the spool and pry the line out from under the holder.  When it didn't wind up underneath, it came out in such long sections that it overlapped the edge at least 6 inches, throwing rocks and everything else at my ankles. Also, used up very quick. One spool only lasted for about 2 hours of use. Would not purchase again!
2902432
I've only used it once so far but it worked as advertised. Make sure you use braided line when casting.
3378897
As much as I like Seaguar fluorocarbon, I am satisfied with this hollowcore braid but not excited about it.  I used Charkbait torotamer braid and it is much easier to work with, as a result I was disappointed with the difficulty of using daho needles in this braid versus toro tamer.
2097823
I needed the braiding to keep the wires protected in the handle bars of my motor bike, and unfortunately this specific braiding did not live up to its expectations.

NOTE: This was a re-order and either the manufacturer changed their product quality or the seller mislabeled the item because the difference between my 2014 order and this order couldn't have been bigger.

1) When you cut the braiding to length it will almost instantly start to fray, not just a little but like .5 inch or more.
2) It is thick, if you need the sleeve to go around a tight corner with 6 wires in it you will have a hard time.
466937
THE FUSED LINE,  UNLIKE THE BRAIDED DOESN'T STAY TOGETHER AND FRAYS.  I'VE PUT IT ON 4 FISHING POLES AND AFTER VERY LITTLE USE THE LINE STARTS TO UNRAVEL, WEAKENING THE LINE AND THEN BREAKING.  I AM CALLING BERKLEY FOR A REFUND OR A REPLACEMENT FOR THE FAULTY LINE.
2097465
Folks, I have had both the 21212 and 21272 trimmers for couple of years. And I have hated both... Both suffer from the same simple problem: neither of them properly release lines. Yes, I have tried to put the .065 lines so many different ways (tighter, loser etc.), but no avail. As a result, my trimming/edging job took 5x times, I had to stop every 10 feet to manually advance the line. And if I got lucky and the line advanced properly then the spool got used up within couple of minutes of edging/trimming.

I was about to throw (give) them away, until recently I thought of a hack. I had .105 flexible line for my 10 Amp trimmer (what I use for brush trimming in the back of the property). Here is the Amazon link to it: https://www.amazon.com/dp/B00MD2APKS/_encoding=UTF8?coliid=I1VJGKJ7IL94BT&colid=1U1YPGUS14IF8 I find this particular line more appropriate, it is softer material and it has the triangular shape to it and as a result I get a very thin blade like cutting path. Rigid, round shaped generic lines will produce a wider cutting path because of the inflexible, rigid curved lines.
Here are the simple steps I took:
1. Measured and pre cut lines.
2. Took the empty spool out.
3. Threaded the .105 line through the first hole. Note: 21272 needed a little of widening of the holes the 21212 had already wide enough holes.
4. Tied a simple bow/nut on the stem.
5. Threaded the line through the second hole.
6. Evened out the line to make sure it is symmetric and the bow is in the middle
7. Removed (unscrewed) the line cutting blade. There is no need for it on a fixed line and I get another half of inch line length..
8. Put the cap back
Take a look at the pictures.

I did a full edging job with both and I cannot be happier. Of course, each line only lasts until you wear it down, but it only took me 1 minute to put in my own pre-cut lines to get going. I created my lines by simply cutting them to the right length. I measured about 10-15 full minute (about 400 feet of edging) continues run before I needed to replace the line (wore it down).

Can you imagine your $30-$40 trimmer working with a .105 line? Can you imagine what output, efficiency and trimming/edging speed you get? Simply amazing... The difference in ease, speed and strength of trimming/edging is significant. And there is significantly less line needed. I can see the $12 200 feet .105 line package lasting me for a year, while I needed to buy the .065 packs monthly.

These trimmers would have earned a 1 star otherwise, but with this hack I am giving both a 5 star. You cannot beat the ease of use, strength and speed at these price points. Disclaimer: I am sure the manufacturer would advise against this hack, so please use it at your own risk. On that note, I know the manufacturers have to sell ready made spools and lines (they make money on them), which this hack would eliminate both. I still think they should look into providing this as an option, they would make a lot more happy customers.

One more thing. The 4 Amp 21212 trimmer is more challenging to do edging with, the wheels on the 5.5 Amp 21272 make my edging job much faster and easier. Both of them do very well for weed eating, it is difficult to notice more power from the 21272, they feel spinning at similar RPMs. With this hack both of these trimmers will do very well for their intended use.
4801450
Kastking is the only braided line I buy. I inshore fish as well as shark and tarpon fish and I've never had a problem with it.
236302
Let me start this review by saying I love KastKing.  I have several of their reels and several other spools of line and have been very happy with them.  Having said that I have to give this line 3 stars because it's the first product I've bought from KastKing that I am disappointed with.  I don't know if my line came from a bad batch or what but it just isn't up to their normal standards.  I bought the Grizzly Brown in the 10lb and it looks and feels like 50lb line.  It's very stiff, almost like brown wire.  It doesn't have good casting distance and unless I'm casting quite heavy lures it gets a lot of wind knots in it.  It just doesn't like light lures.  I've already had to waste at least 30yds of line because of the wind knots and they are impossible to get out.  I will still buy KastKing products, including line, but I will never buy this Masters mono again.
2641738
This is a great product, but can be a little tricky to use since the ends tend to unravel as the wires are fed through.  As supplied, the braid at the ends is heat sealed together, but it is necessary to cut off that part to insert any bundle of wires larger than 1/4".

The trick is to keep the unraveled part short enough that it will be covered by heat-shrink tubing applied to the ends.  I found that I could use a rolled-up strip of paper as a funnel to insert the bundle of wires.  That reduced the tendency to unravel.  It might also be helpful to apply painters' tape temporarily.

When apply the heat-shrink tubing, I rolled a small strip of paper around the end of the braid, then inserted it into the tubing and pulled the paper out. The tubing should be about an inch long, half on the braid and half in direct contact with the wires.

Overall I was very pleased with the results, and I'm sure this gets easier with practice.
3487914
Lost several fish.  Decided to check the line's breaking strength.  Instead of breaking line, I found that the line is so slick that it just slides completely through my knots.  I tied it with a six turn uni knot.  Never had this knot fail before. Will be using different line from now on.
2020937
The line is constantly needing attention. I follow the instructions and give it the proper length called for but it will not automatically advance but either gets stuck at it's current length or break off inside. I have replace the spool twice and continue to have the same problems.
3315783
On mine the actual pliers don't seem to fit tight, as in the split shot tip doesn't line up completely and you can feel play in the hinge. Maybe I got a lemon. The carbide cutters do work flawlessly though, cuts braid better than anything I've used.
4720544
Did not Meet my exception for a new kind of line,  Would twist into hard knot when you caught a fish
2712566
I've used Kastking Braid in the past and found it to be a superior braided line and fraction of the cost of the so called Super Braided Lines. Easy Casting and Limber. Try it you'll like it.
4577427
Like most hose / cable winders its a bigger pain that just rolling the cord up by hand. The cord reels in oddly and the reel itself is to lightwieght so it bends and flexes as you reel-in the cord.