Cheaper version

The cheaper simpler one hides more of the corner being cut:

For that reason, many users of the cheaper version recommend holding it upside down while clipping, which lets you see the counter corner and thus more easily position it correctly:

Deluxe version

The deluxe one seems easier for most people to use. You see the entire counter and easily position it snugly against the clipping corner:

The tool comes in several sizes (defined by the radius of the circle, of which a quadrant is being cut off the corner of the counter), and different people prefer different sizes. The sizes 2, 2.5, and 3 mm all are popular.

People frequently ask "Which size is best?" but there is no objective "correct answer". It depends on your personal subjective preference for how much or how little rounding you personally want.

Here are some sample photos of various sized counters and tool radiuses:

2 mm corner rounder:
The smallest subtlest size. Safest for small counters or counters with info printed close to the corners.

2.5 mm corner rounder:
Some consider it the best "middle ground" size.

3 mm corner rounder:
The largest size in popular use. Some feel the 2 mm & 2.5 mm are too small/subtle for larger counters.
5/8" counters:

1/2" counters:

Size comparison:

Buying from China

Apparently both the basic and the deluxe models can also be bought directly from China; this thread has info and says that the manufacturer is 方菱 FangLing and the product is 圆角钳.

Maintenance issues

They normally won't need sharpening for a very long time, according to orelamruss from the company:
On the sharpening question, we have yet to see one of our punches that actually required sharpening. It will eventually happen, but the tool is designed as a punch rather than a cutter.

A few problems have been reported, with solutions and workarounds.

1. Don't try your new clipper on real counters first! Get practice with it on scrap material first. Also, some users reported that their clippers came with some grease in the cutting area, which left stains on the clipped material, so it is good to test for that first. If you have grease, try clipping scrap material until the grease is all wiped away naturally, or you can (in extreme cases) disassemble the clipper to remove the grease more directly.

2. There is a hinge part made of plastic in the deluxe model which has broken for a few users. This is caused by squeezing with too much pressure. You can squeeze only far enough to clip the counter, instead of squeezing as hard as you can. (This will also be easier for your hand and arm muscles!) Alternatively, some users have attached a block inside the handle to literally prevent being able to squeeze them too close together.

3. A few users reported a problem with a face of the counter getting scraped near the edge somehow. Possibly an issue of practicing one's technique, or possible a manufacturing defect. So this is another reason to try a new clipper on scrap material first.

4. After thousands of uses, you might need or want to lubricate your clipper. There is a video showing how to do this to the deluxe model. It is recommended to use some kind of high quality (e.g. silicone (here, here, etc) or Permatex 80345 White Lithium Grease) lubricant instead of ordinary oil or WD40 (which would risk leaving messy marks on clipped material). Tradeoff: spray lubricant is more likely to make a mess and get where you don't want it (e.g. the cutting area) but is easier to apply; liquid or grease lubricant can be applied more specifically but you may need to disassemble the device (but this is really not very difficult).

5. One user reported a problem with a hollow vertical metal cylinder (within which a metal rod slides) sliding up (from the plastic body in which it is normally held firmly). This seems to be an unusual isolated incident. See this thread for details.

6. A couple of users reported being unable to clip or squeeze the handles together in a newly received deluxe model because the metal cutting surfaces arrived slightly misaligned. See this thread for details and discussion of unscrewing and rescrewing a metal plate to adjust the alignment.

7. In this thread some have reported that DVG counters seem thicker than average and are harder to fit into the clipping hole and are harder to clip. There was a report of one clipper breaking while clipping DVG counters.

(If anyone has direct links to relevant comments discussing any of these issues, please add them to this wiki page.) :)

Searching youtube.com for "Oregon Laminations" etc will find useful videos, e.g.:

• Oregon Laminations Lubrication
• Repair of Oregon Laminations Corner Cutter Punch

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PS: To store counters neatly organized with compartment dividers in GMT trays, see the thread GMT Counter Tray Dividers - 3 Styles.