Then things should be a huge amount better - however there are still some niggling issues I'd like to fix to do with the connection sometimes failing if your code is really busy.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If you update with the puck.js firmware zip from here: http://www.espruino.com/binaries/travis/47df0cf7e15453bc2485c2d6a9f1756a1de072d4/
Then things should be a huge amount better - however there are still some niggling issues I'd like to fix to do with the connection sometimes failing if your code is really busy.