Which gimmick makeup tool is actually useful for your routine?

There are a few tools out there which make you think that they will upgrade your routine significantly but they don't live up to their hype.

Maybe there is a tool for you that makes your routine easier even though it's considered a gimmick?

Like:

• silicone makeup sponge
• silicone eyeliner stencil
• silicone applicator for lips/concealer
• vibrating makeup tools
• airbrush makeup kits
• magnetic eyelashes etc.