Buy the Bosch HMD8053UC.

Cosmo saves you money up front and makes you gamble on whether it survives the month.

What was compared

1. Built in, so it has to survive day one
Cosmo owners report a clunking sound from the first day and reviewers made a video literally titled Built To Fail about this drawer class. A built-in microwave is a pain to pull and replace, so early failure risk matters more here than almost any other appliance.
2. It senses when food's actually done
Bosch runs automatic sensor programs that read moisture and adjust cook time on their own. Cosmo gives you four fixed presets (melt, soften, popcorn, beverage) and otherwise leaves you guessing on power level and time for everything else.
3. Someone answers the phone when it breaks
Bosch is an established global appliance brand with a real parts and service network behind a built-in fixture you cannot just swap for $30 off Amazon. Cosmo is a budget newcomer whose own listing sits under 200 total ratings for the whole model.
4. Cosmo's own ratings cannot agree with themselves
The identical Cosmo drawer swings from 3.4 to 4.7 stars depending on which color or size listing you land on, which smells like inconsistent build quality, not just unlucky reviewers. Bosch's spread of reviews stays in the same lane: quiet, easy, happy.
5. Yes it costs $460 more. Buy it anyway.
The Cosmo is genuinely cheaper, $788.99 against $1,249.99, and that is real money. But this gets built into your cabinetry for a decade, and the research shows Cosmo's failures hit on day one while Bosch's complaints show up years in, after it already earned its keep.