As a material for dildos and other sex toys, silicone has few drawbacks beyond mere preference. While many people like the "squish" and more lifelike sensation a silicone dildo can provide, other people prefer an unyielding dildo made of steel or glass. Other materials are also better for temperature play. Silicone dildos may also break down if used with pure silicone lube. Check with the toy manufacturer about which lube types are best or stick to a water-based lube to be safe.
Silicone dildos are non-porous, so they don't have the potential to hold onto and grow bacteria like some other skin-like materials like cyberskin or jelly rubber. However, proper cleaning is still crucial, especially when sharing toys or using them both anally and vaginally. They should always be washed after use with warm water and a mild soap. For a more thorough clean, disinfect them in boiling water for five minutes, run them through the dishwasher, or soak them in a mix of 90% water, 10% bleach for 15 minutes.
While silicone is durable, make sure to keep your dildo away from sharp objects that may tear or puncture its surface.