There are YouTube videos of people trying to destroy knockoff carbon handlebars and were unable to do so.
It’s sort of reassuring.
Unfortunately, there is probably no quality control for these. So from a statistical perspective, you really can’t determine if the handlebars are going to last 15 years or break the first ride.
I think it’s important to categorize your knockoff gear before buying.
1. A failure will ruin your day, possibly injuring you, possibly injuring others you ride with. Death without too vivid of an imagination. Handlebars, wheels, frame
2. A failure would annoy the heck out of you and make it difficult to get back, especially on time. Seats, seatposts drivetrain
3. A failure may be uncomfortable or even simply fixed while on the road. Clothing, gloves, saddlebags, sunglasses.
Youve got to make these decisions for yourself and how far you ride from help also factors into that.
You also need to add up how much money it’ll cost you, especially if the part is likely to need replacement more frequently.
For me, I love my $12 long sleeve jerseys. That’s about it.