there is a bit of confusion talking about Mother bar and 333. They are 2 different locals in the same building. 333 bar is downstairs, there is always queue and actually i've never been.
The Mother bar is located on the first floor of 333 bar and this one is my favourite bar during the week (untill thursday) in Shoreditch. The desin is cool, 80's wave, the music is always very nice and the people are glamour and in a large range of age and type. The entrance is free as well: what do you want more? Try and you will enjoy it.