If you have the bux, they are nice to have. The compressor is a little annoying, but only runs often if there is a leak in the system. They are not all that durable, especially for a rear application.
It realy depends on you axle size, vehicle weight, tire size, and you driving habits.
I've installed tons of these things. The install is what will make or break the reliability. Be sure to get someone who knows what they are doing to do the install.
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