After living in Downtown Los Angeles for over 2 years, I have had about 5 bouts of tire leaks due to punctures.  Before I found out about this product, I used the traditional DIY method of repairing my tire--with a traditional kit (you know--the kind you can get at Pep Boys or Autozone).  It was always an exhausting, time consuming process.  I'm not a very strong person and most of the punctures were with small objects (pallet nails, staples). Imagine having to stuff a thick, dull rasp tool through extremely thick tire tread.. Not fun. Many times I felt like giving up.  Also, threading a thick rubber embedded cord through a very thin slot was always difficult too.  Always ended up having to use needle nose pliers to pull it through requiring several tries.Along comes this product. I used this on my latest repair and it was simply amazing.  WOW.  Slick it up, insert the little plug into the tool, slick up the tool and hole with some more spit, and push it in.  The tool is smooth and goes in with way less effort.  Pull it out and snip the remainder.  Done!  By a very large margin, the absolute EASIEST tire repair tool you will EVER use.For *extremely* small holes, it can still require a bit of effort, but no where near the unimaginable effort that would have been required of the typical rasp and thread-end tools.  Just be sure to use spit.  (Water doesn't work nearly as well).Summary:PROS:-Makes repairing the smallest leaks much easier.-Fast.  Can repair a tire in half the time.  Some have even repaired their tires without removing them.-Permanent. Dynaplugs have been approved in Europe for permanent tire repair.-Use way less strength.  Only a single tool, and it is very thin.-Convenient storage in handle for extra plugs, and the pipe cleaner. There is enough room to even store a couple of small alchohol swabs in it.-Can be used to repair previous traditional plugs that have failed.-Fool proof.  Awesome design allows you to push the tool in ALL THE WAY, and pull out.  Traditional plugging can be pushed in too far or not far enough.-Can repair other failed patches.-Versatile.  Dynaplug can be applied multiple times to the same hole to repair larger holes.CONS:-The tool may get dirty on the inside and be hard to insert additional plugs in the same session.  The tool comes with a felt pipe cleaner which can be dabbed in alcohol to clean the inside.  Best way to avoid this is to ensure the plug and tool is well lubricated.I am truly thankful to the inventor of this amazing little tool.  It has enabled weaksauces like me to fix a tire in a matter of seconds :)Verdict:  HIGHLY RECOMMENDEDUPDATE: 4/24/2013  (since January 11, 2012)This product is suitable for emergency patches but I have deemed them not good enough for permanent repairs for two reasons:1. The brass tips are not secured onto the plug strongly enough.  They can pop off just by tugging on the plug slightly. Because of this, I have had several brass tips fall into the tire and cause rattling from inside the wheel at high speed or when making turns.  It's very annoying.2. I read somewhere that these plugs were good enough for permanent repairs and assume it's for the reason that the brass tips keep the plug from coming back out.  That would be true only if the brass tips are secured tightly to the plug.  But for this reason they are functionally not any better than traditional plugs for holding in air. Their only benefit is their size, which makes it easy to plug smaller holes.  The downside is that for larger holes, you have to use many of them, and each time you insert a new plug, there is a high possibility that the insertion may push on an existing tip and cause it to come loose.The following photo was sent to me by my dealership when I complained of loud clicking noises coming from the rear wheels:https://sphotos-a.xx.fbcdn.net/hphotos-frc1/400750_10151554978947590_716723726_n.jpgFor this reason, I revise my recommendation to "RECOMMENDED--FOR EMERGENCIES ONLY.", however I have lowered the review to 3 stars.