One of the biggest complaints for flash modifiers is that they either don't stay put or are hard to swap, but the MagMod MagSphere uses a magnetic mount system to stay snug over any hot shoe flash. The magnetic sleeve makes it easy to swap the diffuser with another modifier, such as the snoot. While flash diffusers are often large and bulky, the MagSphere is compact and easy to use.
The silicone rubber of the MagSphere spreads the light over the scene evenly, softening shadows but still adding that extra pop of contrast from the flash. The quality of the diffused light from the MagSphere is flattering for portraits, though the system has a number of different uses. Gels can also be added to alter the color of the light.
While the magnet attachment system is one of the biggest perks, it has its downsides. The system is surprisingly heavy because of those magnets and some flashes won't stay in a vertical position with the added weight. The diffuser is also sold separately from the attachment, which drives up the price to around $75, not horrible, but certainly not the best value out there. The MagSphere is an excellent diffuser for photographers tired with messing with diffusers that won't stay put.