nice, i think this architecture is much better than the old greenaddress html thingie.

some remarks:
i sent 100 mBTC from mycelium to greenbits. it came over as "100.000" bits, while it displayed "$ 21.61" so the "thousand-mark" was the same char as the comma - incorrect and confusing.

the time received was "59 minutes" although it was just 10 seconds ago.

i wondered why it could not generate new deposit addresses offline

the qr code is "blurry"

there was no way to switch the unit bits to full bitcoins or mbtc. ( after testing more, i was able to change it in "send" but i really expected it in settings)

when trying to send back recently confirmed coins (2 conf) - i got the error msg "you need to wait 6 confirmations" - this was likely because i checked the "instant confirmation" - if this is not possible why not hide it/grey it out

when entering amounts (10 mbtc) my phone turned the screen off and on - it was changed to 9.96.. something. (also when rotating phone)

when ending the wallet i have to type in the full 24 wordlist - if i had just checked the button without actually doing the backup my coins would be gone now. i suspect the next thread will be "please help me recover my funds from greenbit" - many people just check boxes without reading it - or they make a mistake in writing down the pw. there seems to be no way to actually test the seed before depositing money.
the default should be to remember the seed and just check for pin (which i did not set)