This here (left) is my first Brushless Tiny Whoop build! It weighs just a shy under 25g, and is a quick beast! I was having some issues with the receiver at first, but upon reading the forums; bigger batteries with higher C ratings must be used instead of regular whoop batteries. I was a little disappointed at first, but after my first problem-free flight with the 450mah batteries, I was sold. I am currently waiting for a different camera and canopy to put on to finalize its aesthetics, but for now this will do just fine.
NOTE: This build is a power guzzler. I'm barely getting 1:30 (sometimes a lot less depending on aggressiveness) when I fly indoors at 60-75% throttle with a 450mah battery, and almost no luck with 260mah. The next chance I get I would probably go with a 15,000kv motor and hope to get at least 2:00 comfortably. The voltage sag creates telemetry/receiver issues and it starts to have trouble.

Update: currently using a clear BetaFPV canopy, the Tiny Whoop FX900TW camera, and downgraded the motors to 15000kv (flies much longer now but could be better)!