The cheap alu have a harsher ride quality, because the material is very brittle, the tubing need to be thicker to compensate for this, and doesn't absorb road vibration as well as steel.
Decent alu frame nowaday have way to absorb vibration (curvy seat stay for example), as well as finding technique to make the alu thinner without sacrificing strength.
Cannondale were considered to be the most comfortable and lightest alu frame you can get from an OTP, how true this is nowaday I don't know as I'm sure other manufacturer managed better as I write this.
The CAAD10 IMHO, were the best performance alu frame you can get for the money, as long it fit you, as it's a proper race fit.
The cheap alu have a harsher ride quality, because the material is very brittle, the tubing need to be thicker to compensate for this, and doesn't absorb road vibration as well as steel.
Decent alu frame nowaday have way to absorb vibration (curvy seat stay for example), as well as finding technique to make the alu thinner without sacrificing strength.
Cannondale were considered to be the most comfortable and lightest alu frame you can get from an OTP, how true this is nowaday I don't know as I'm sure other manufacturer managed better as I write this.
The CAAD10 IMHO, were the best performance alu frame you can get for the money, as long it fit you, as it's a proper race fit.