I am on JR2 now and to me it looks like it is superior to the usual JPZ. Good battery life and very fast connection speed. In fact the first connection test i did with the "Speed test" app was a new all time high. I surpassed the best connection i had with JPZ before by 2MBit. Now that is partly due to better network by my carrier (a retest with JPZ later also got very good connection), but i reached both in up- and download the theoretical maximum with JR2. So it is rella working great. It also seems connections with only EDGE are a bit more reliable than before - especially while in a train with 300 km/h (187 mph). That was always a big issue for me in the past because i travel a lot north to south in germany. It feels like there are now a lot less black spots than before. I will definitely stay on the JR2 modem.