Zoom F2-BT

I bought a pair of these to try and deal with a lot of on location, walking recording I do for a music podcast. I use them for back-up and to give me an option on the vocals when I;m recording music in the field. In the past I;ve used a pair of zoom f1s which are ok but need a lot of fiddling with the levels. These are brilliant and dealt with the shifts in inouts levels magnificently. I bought the blue tooth versions as I want to use a timecode synch but am struggling to get it to work (and there doesn't seem to be instructions anywhere). The build is a little flimsy and I worry about getting the data card in and out. But overall a total lifesaver.