I've been rebuilding the drivetrain on my surly ECR., which I use for daily commutes trail riding and bikepacking. The original 5-arm crank was difficult to find decent chainrings that would mount on the old surly crank. The new crank holds the chain great with no slip, even though I'm running with a 9 in back at the moment. I've bashed around with it pretty extensively for the last 3 months and it shift easily and grabs the chain quickly with no slip. Highly recommend.
Very little cost to protect your carbon bike that cost in the thousands. I have these on all of my bikes and the gravel bike is no exception, prior to first ride this was installed and prevents chain drop and damage to your frame, it is a must buy.
Jagwire's Pro Shift Kit is a handy package that has everything you'll need to re-cable your front and rear shifters/derailleurs (cables, housings, and hardware). The cables are lightweight, strong, and long-lasting, and the housings (available in a variety of colors) are pre-lubricated. The housing ends and ferrules are well-made, and the included instructions are easy to follow. The cables provide quick, crisp, and accurate shifts -- better and more durable than other cables I've used. Highly recommended -- you won't regret buying them.
I run a front brake on my fixie for the steep hills and the added insurance if I snap a chain. Ive been running these for the last 1000 miles on my fixie and they are still as strong as ever. They work great and Ill definitely purchase them again.