Clutch derailers are the only way to go.
"My bike shifts so smooth now. No rattling chain."

Overall rating: 4.75 / 5 from 8 reviews.
Review topics: ["shipping","issues","value","derailleur"].
"My bike shifts so smooth now. No rattling chain."
"Great"
"I bought it 3 times and it consistently delivers value and great performance. Shifting is crisp. I never had any issues."
"Used this for a budget1x9 conversion of my rockhopper. It’s an awesome upgrade for the money and I highly recommend"
"Works great, price is right. Worth the extra cost from acolyte groups as the derailleur is much nicer and quite a bit lighter."
"We have 3 of these drivetrains in the fleet now, no issues so far. Easy to setup and adjust. Not as snappy as a high end system, but shouldnt be expected for the price. My only complaint is that the thumb force required shifting into the lower gears seems high compared to other setups. Overall I recommend."
"Very easy purchase. Would buy from again."
"Couldnt be happier with the performance of this drivetrain. So easy to install and setup,clutch works great. Shipping was super fast and Tim at Cambria bike was a pleasure to deal with. They definitely earned my business in the future."