Bad chain or poor install??
599433
Used this to replace the old chain on my 7-speed bike after about 3000 miles.  Installation was a bit painful due to my incompetence.  It worked fine for a couple hundred miles and shifted way better than the old grubby chain I took off.  However, it broke while I was 25 miles from home.  Not sure if it was a bad chain, or I just suck at installing properly...
1534627
Out of the two I purchased, neither had chain still attached to the man. Whip out your needle nose pilers, you'll have to fix it yourself. Decent otherwise.
804100
The chain was twisted on this one as well. I also had to replace with a better chain.
636490
Mine was the same experience as most others, failed immediately out of the box.  Unfortunately, I waited a while to install it, and it was beyond the return date for Amazon.  I also didn't read the reviews before purchasing, probably wouldn't have done so.  2 strikes against me...
736645
Bad experience, something broke when I was installing, and it's to low for my expectations
1807134
So I took this item out of the box added oil, followed all the instructions to mount the chain and charge the battery. As soon as I go to turn the chainsaw on I hear a clicking sound. Which with electrical equipment that normally means the equipment is being overloaded. I took the cover off of the chainsaw and noticed that there was a plastic piece broken where the chainsaw glides and the blade was catching it. I received a broken chain saw probably one, that was purchased by somebody else reboxed and sent to me. I think this is true because when I received the chainsaw everything was already together and ready to go and reading some of the reviews a lot of people mention they had to put it together themselves. I am done with these electrical power tools and all this plastic stuff I returned this item with hopes to get a refund. Sorry Amazon I have always had high hopes not anymore.

I wish I wasn't so mad that I boxed the item right up and sent it back before taking a picture it could potentially help somebody from receiving the same item I did
1776974
Just put this thing on my bike and I must say, it does look good.... It went on with no problems (if you have access to the right tools for the job) and only needed to have 5 or so links trimmed to fit nicely on my CX bike with no excess slack throughout the gear range. This chain is supposedly direction specific and is designed to shift easier than a standard chain... I have yet to see if this is true but my bike does need a tune-up so I need to sit down with it on an afternoon and get it nice and dialed in, then the added machining benefits may be more pronounced. The pin was alittle on the difficult side to put in but again, it comes down to having the right tools for the job (my chain breaker is currently out of commission)

Overall it is a nice chain, but is the new 6700 chain worth the cost over an older style cheaper alternative? only time will tell.
3344066
The chain guides are sloppy and the tensioner for the passenger side head kinda came apart on installation. I know these kits are hard to find and thats why your here to order one but I'm afraid I will have to take this apart soon and re do it. I've been changing timing chains for 10 yr.
4732518
There is "Don't use any chain tighter with this product" on the product menu. Im not sure why many people bought chain tighter with it and I just followed them.
584854
I think they are good chains if you're used to chains. But installing them on my tesla was near impossible so I returned them. May be easier to install on cars with more larger wheel wells.
3177070
Front derailer doesn't work properly - won't switch to the highest gear (left-handle 'friction' gear). I've tried leaving less of the wire out for it can be more open and farther out to actually be able to move the chain up onto the highest/largest gear, but it seems to have a limit on its own and not meet my requirements. I live where it can be pretty steep on the trails (downward and upward) and so switching gears is a must if you want to get through it all smoothly and not want to be panting or cycling in place. I'd have to move the chain manually to the last gear, but won't go back up there if I wish to change. The bike is great and all, but it's the small things that matter which can ruin the experience. I'm going to have to take it to a bike shop where I'm sure they're going to charge me a good amount to the problem.
1016186
I put it together, warmed up for a minute, then turned the resistance up. When I pedaled hard the chain started jumping the teeth of the gears making a loud pop every time it happened. I checked the tension and it was pretty tight, but it's a small chain (smaller than a standard bicycle chain) and apparently can't handle the load. So I turned the resistance down, but again when I started pedaling hard the tension band wrapped around the wheel got hot which caused it to seize up (in effect increasing the resistance and causing the chain to pop again). I'm gonna have to return it and buy something higher quality or join a gym :(
4578867
I think it was missing the brackets that holds sides apart at correct distance, (this one was used).  We had to modify the installation, but once installed it works fine. I also bought a new one, it had all four side on the bottom frame, made installation much easier.
3252919
JUST GOT THIS CHAIN PER UPS...I WAS HAPPY,,THEN I OPENED THE BOX AND THE CHAIN WAS BROKEN !! IT WAS SEPERATED AT THE CLASP CONNECTION CONE...CHAIN WAS TO BE CONNECTED INTO THE CONE AT THE CLASP...I GOT A CHAIN THAT WAS NOT CONNECTED JUST A HOLE WHERE THE CHAIN WAS TO GO INTO  TO CONNECT CHAIN...DAMN !!!!! AGAIN THERE WAS AN ADVERTISEMENT PER AMAZON, WITH A GOOD DISCOUNT ON THE PRODUCT,,,SO I BUY,,,AND THEN AGAIN GET SCREWED...THE LAST CHAIN I BOUGHT WITH THE HIGH SHIPPNG WAS DEFECTIVE...THE CROSS I BOUGHT WAS DEFECTIVE,,,REFER TO MY REVIEW,,,IF YOU REFER TO MY SALES, I HAVE SPENT ALOT OF FUND'S WITH YOUR FIRM,,,NOW AS A 20YR. VET OF BROADCASTING, I AM COMPELED TO STOP THIS ABUSE OF AMAZON AS TO IT'S CLIENTS..YOU SAY YOU HOLD YOUR CLIENT'S TO HIGH STAND'S...THAT'S B.S. I WILL NO LONGER USE YOUR FIRM, AND WILL CREATE A WEBSITE TO DEFER YOUR FIRM,,
4800787
;the package came without  instructions. So I could not determine if I had all the parts. It is obvious that the parts that were included were not for this bike. I had to modify the left petal to keep it from hitting the arm. The chain guard is for a different bike. Amazon said I could return it, of course after completely unpacking the bike it would have been a significant hassle to return this. They offered a partial 20% reimbursement so I took that and am purchasing the necessary parts to complete the assembly. I called manufacturer to get thea assembly instructions but turns out this is a discontinued model and they no longer have parts or user manual or assembly instruction for it. To top it all off the bike had various dings in the paint job. Learned my lesson about buying something like this from Amazon. I thought I was golden because it was sold by Amazon but it is actually worse. They cannot send out missing parts and the manufacture washes their hands of the whole affair.  Very Sad.......
4941918
Very simple to install set on my vehicle, took a total of 5-7 minutes max. Once I passed cal trans inspection my drivers side chain came off (picture attached) and ended up in the middle of the road. I drove around big bear with my passenger chain on (photo attached) for most of the day, until the second chain came off while driving and a nice driver flagged me down and handed me my chain. This was every unsafe.
1374526
Take my review with a grain of salt because there is so many factors that are involved in chain wear and I'm not an expert. But I've had two of these chains stretch to over the recommended limit within a couple of month. With a new flywheel installed and regular lubrication. I commute 11 miles a day in a hilly area... Not satisfied still gave it a 2 star because it was easy to install and after all it could be my flawed maintenance.