Sadly mine won't arrive until end of May at the earliest. Seems like they were snapped up as soon as they arrived. I have the GT-11 at the moment but it doesn't like tree cover at all. I also have a Garmin 60CSX which is good if bukly and doesn't give DOP figures. Comparing tracks from the 60CSX with the GT-11. The 60CSX (SiRF III chipset)seems to record sharp changes of direction more faithfully so bends are mapped in the correct place. Hopefully the BGT-31 should give similar results but with the advantage of DOP recording and less bulk.