Is the M52 Carbon good for street riding?

No. It is a motocross helmet with a goggle eyeport and no visor, so it is meant for off-road use. For street riding, a full-face helmet with a visor is the better choice.

Does it work with goggles?

Yes. The eyeport is sized for motocross goggles, which is how the helmet is meant to be worn. Check that your goggle frame fits the opening before you buy.

How does it compare with a regular motocross helmet?

The carbon shell is lighter and stiffer than polycarbonate or composite shells. It also lacks a peak and visor, so it is simpler but less versatile than most motocross helmets.

The helmet itself. A helmet bag or spare parts are not listed, so plan on buying a bag separately if you need one.

Is the carbon shell worth it over a cheaper helmet?

Carbon saves weight and adds stiffness, which helps on long motos and hard landings. If you ride casually, a polycarbonate motocross helmet protects just as well for less.