The Handy (V1) basically secures your fleshlight / onahole / sleeve with a 50mm velcro strap. If the shape of your toy allows, then it will stay on. The issue is that V1 Handy’s motor has limited torque. According to my testing it’s only able to hold ~380 gram before it become sluggish. So realistically it may only able to hold smaller sleeves such as the original Handy Sleeves, or Fleshlight Quickshot.
The Handy 2 is marketed to have better performance and can be “overclocked”. I don’t own one to tell.
If you find yourself within the Fleshlight ecosystem then maybe Keon won’t be a bad option. However do look into the OSR range of DIY options which are also designed with Fleshlights in mind. I’ve written a guide on it: [Guide] What Is the OSR2 / SR6 / SSR1 and How Do I Get One?