Hi Petita, I own both the Koil Kutter and the Jump Ringer. The Koil
Kutter is a terrific place to start if your budget is limited or if
your volume will be small. However, if this is a tool that you plan
on using for a long time and for extended periods or high volume, I
would recommend the Jump Ringer (which is the original product and
the KK is the economized knock-off of it). It is superior in quality
and all of the components are finely tooled and made to last. As far
as the cutting, I find that the rings I cut with the JR are cleaner
of cut and need very little to no deburring compared to the rings I
cut using the KK. The tool worked right out of the box, whereas with
the KK, mine needed quite a bit of tweaking and adjusting to get the
correct fit with the cutting base. Luckily I have a very mechanical
husband who was able to modify it so that it worked correctly.
Really, it is just about quality. You can always get by with the
economy version of any tool, but you must pay for the quality and joy
of using a high-grade tool.
Oh, the mandrels that you can get with the KK are a simple set of
transfer punches with slots cut in the ends to hold the wire. You
can usually find the (exact) same metric set without the slots (just
secure the wire in your drill chuck) for $9.99 or less, so if you go
with the KK, I'd recommend checking out harbor freight or searching
around for a set of metric transfer punches to use for mandrels.