Durable and effective.
925477
I've installed 4 or 5 of these now.  My oldest one is still functioning, in use since 2012.  I did notice minor performance degradation as I'm sure the fluid degrades over time, probably coagulates in the heat sink and slowly evaporates thru the tubing.... Seeing maybe a 5-10% loss in 5 years.  I'd say that's pretty incredible durability for such a small, affordable system.  Keeps my 3770k OC at 4.5 GHz cooled to 60C at full load.  Can't really go wrong with one of these.
2724977
These things rock.  They are cheap and effective.  Mine has held up to more abuse than I would have expected, and I will certainly purchase more.
1222734
This inexpensive collar has proven to be very durable and long lasting.  We use it every night and our black, Chihuahua / Rat Terrier is visible from a distance.  He plays hard and despite the best efforts of his doggie friends, the collar remains in place and shining brightly.
3360621
Cute,  durable,  effective.  Neat item,  worth the scratch
2376051
This has held up quite well on two doors at our house. Very pleased with the durability and functionality of this product.
3187782
Others claim to be heavy duty, this one simply boasts of being durable.  How humble!  The sides are reinforced with some tough fabric, the design itself is more of a wrap around design, reducing the amount of seams (therefore reducing weak points.)  I've been using it for more than a month, and it doesn't show signs of wear at all.
3513015
Strong and durable.  Years later my iphone still doesn't have a single scratch and I've dropped it quite a few times.
1592039
Been using this for months and it works fine and is durable.
553904
very durable. we like that the inner plastic compartment is removable so it can be cleaned well.
1349306
Effective and sturdy.  It is a little bit bulky for my preferences but it does a good job.
4932583
Very durable.  Holds up to repeated hits from large rifles as well as handguns.  Only problem is that many ranges require such targets to be up on a berm.  Usually this rolls downhill when struck.
3865967
Have used them a few times and they work well. Durable and easy to use.
3993816
Very durable . Still strong with minor wear after months of use . Used on a 90lb. Pitbull.
3565712
durable, the exact product that I am looking for
1915863
Very durable.  The only kind  of dog collar I have had for our current and past two dogs.
908120
Durable and washable. Used for almost a year and it still works fine. Suck once a week.
4039
Durable and functional. works exactly as advertised. I bought 2 and made my wife a happy life. I've only had them over the summer but so far I'd recommend them to a friend. we'll see how they hold up in 2015 but the matal base gives me some confidence in it's robustness.