Don’t expect any big feature upgrades here. The new modules don’t add support for Bluetooth or multi-date formats, with the LED backlight being the only major change. That said, the more efficient LED light does improve the battery life slightly for all three models. For instance, the GW-6900U is now rated for up to 10 months of operation without solar charging, up from nine months on the original 2009 model. There are definitely fans who prefer the old EL panels for the retro vibe and that...