more accurate than a stop-watch, less accurate than laser gear, so a decent compromise really. the biggest factor is obviously the road you're using since it measures g-force, if the road has uneven parts or is slightly uphill/downhill the results will be erronious.
i have two if you want to buy one, retailing on the stands at vwaction for ?120+ , im asking ?65 plus postage, brand new still boxed.
p.s i managed a 0-60 time of 6.21s on a perfectly flat road
