I won't buy gopro karma based on the single reason - weight:
karma drone (no battery, no gimbal, no camera), 1006g
karma battery, 545g
karma stabilizer, 230g
karma(incl. battery, stabilizer, Hero5 black camera), 1898g (4.18lb)
karma(incl. battery, stabilizer, Hero5 session), 1857g (4.09lb)
...