Somebody has already tried LPC1114FN28/102 DIP28 on a breadboard with a "blink a led" test code.
See: http://www.meatandnetworking.com/tutorials/lpc1114fn28-with-open-source-tools/ for all details.
The test just says that this ARM is relatively easy to use by hobbyists. However, it does not prove anything about the performance of LPC1114FN28/102 as compared with an Atmega328p, for example. If it is not 10 times faster, likely AVR funs will not abandon so easily their favorite microcontroller for it.