Two days ago I did some mapping in the Bienwald again, from Neuburg up to Schaidt:
I used the recently purchased Wintec logger. The tracklogs of the Wintec seem to be not as accurate as the ones I got from my previous GPSr. Furthermore the Nokia N810 loses the bluetooth connection to the logger every now and then, without any obvious reason. In the worst case, you need to reboot the tablet to reestablish a connection.
Anyway, if you can cope with the aforementioned issues, you will get a good mapping combo, especially if you use osm2go for mapping.