I think the newer ones are better, I got one of the first batch, and I was underwhelmed, although it still does work…mainly because of the antennas physical shape allowing it to be placed right up next to an xSeries
I believe there is a firmware/tuning fix,
possibly in this post
I haven’t done this myself.
Agreed, it is a better form factor, but I don’t know how others find theirs, mine works fine on flexies, but to get good reliable reads on xSeries, i have to pop my cover off so it looses its cool factor
Also there are a couple of good mods on the RDV4 with the DT LF Antenna, but still in my opinion, not worth the extra expense.
In my review thread, there are a couple of links to those mods