MeanROM, which we covered five releases ago, became the first, or one of the first HTC EVO 4G LTE ROMs to be released with the new 1.22.651.3 OTA base. Along with the phone responding significantly faster and snappier for some just due to the new radio, MeanROM includes a host of software updates and patches from the new HTC base and a new overclocking module that allows you to clock from 1.5-1.9ghz using the stock kernel.
The new base fixes a few issues with WiFi, time zones, and 3G connectivity for many. The new MeanROM also adds multitasking tweaks, a Facebook photo fix, a super-extended quick settings, and a host of misc tweaks and updates that make an already amazing ROM into an even better ROM.
The ROM developer suggests doing a complete wipe before you do an update to version 1.4, but I was able to update from 0.9 to 1.4 without doing that and suffering any apparent harm. Your mileage may vary.
You will need the new OTA base in order to reap the benefits as MeanROM does not include the radio bits, so if you’re on the previous base, grab a flashable version without the new HBOOT and flash, and then let us know how the new MeanROM works for you.