I was just watching a GM Hikaru video (bullet speed run) and be briefly talked about this. He said her recommends people stay away from bullet until they have an “over the table” elo of about 1800 (1900 or 2000 online). He said you could probably play 5|0 blitz once you have an elo of 1200 in rapid.

It was an eye opening comment for me. I play a lot of 3|0 blitz and should really just be playing rapid as my elo isn’t 1200 there yet… :/