The Tinyshark frame by Falcon Multirotors is a beast. brushless, CRAZY quiet, and runs on my whoop packs. this thing is quiet. like super duper quiet. I love it. LAZD has amazing support, and his designs are great.

PROS
Frame is small
build is moderatly cheap.
runs off my $3 whoop packs

CONS
The tinyfish fc is great, but the pads are so small that I desoldered multiple smd components while trying to go bridge boot, and putting on buzzer.

NOTES
lubricate the 1103Bs. It makes a really noticable difference.
Remeber those annoying rubberbands that went on your braces? Those make perfect battery holders. loop them around the arms and your perfect.