I can only speak for myself. This is a really cool app, but I probably wouldn't want to use it during actual play, unless the game I was playing was very specifically on brand with it (retro-futuristic science fiction or cyberpunk, maybe), the reason being that it would likely distract from the aesthetic and the imagination-play otherwise. If I'm playing in a fantasy, steampunk, gothic, or even modern day (horror, action, investigation, supernatural, etc.) setting, I wouldn't want my rolls to be associated with a robot. 

If I WAS playing in an appropriate setting, however, this could be a cool  little addition to the vibe. It's certainly VERY well made. Personally, I think you're on to something here. If you plan to create a larger variety of themes for this (or have created them already), I am sure some folks will be interested in using them to enhance the mood of their sessions and just add a bit of fun to the proceedings. You know, a mechanical calculating machine for steampunk, a divining pool or enchanted mirror for fantasy, a sentient skull amulet for horror or gothic fantasy, etc.