Here's a link to some youtube videos I've made based on the above HW/SW combo:
MSR - 370Z - Sep8 - YouTube,
TDE MSR-Houston Nov 6 2011 - YouTube. The lap/split timing with aLapRecorder is very accurate w/ the Qstarz unit in 5hz D-GPS mode, but as I said above, Trackmaster is the software that will give you a realtime heads-up display of current splits.