Flipz, the developer of Fresh ROM for the EVO 4G and the HTC Hero, has been quiet since the release of Fresh 3.5, and it's no surprise - Sprint hasn't pushed out anything to our beloved EVOs in months. Since Fresh is a Sense ROM that follows official releases, as opposed to being built from AOSP like CyanogenMod, I didn't really expect to see another Fresh release until either the next leak or an official Sprint release.
It's no secret that my EVO 4G runs a custom ROM called Fresh - it is one of the best EVO ROMs, free of bloatware and full of tweaks that make it fast and efficient, while keeping stability rock solid. The developer, flipz, is very good - he's responsive to Sprint OTA updates and bug reports and usually sorts out any issues in a matter of days.
Custom ROMs For The Hero
There are pretty much only 2 main Sprint Hero custom ROMs - DamageControl (by damageless and TrevE) and Fresh (by flipz). Both are very good, have an excellent track record, and great communities behind them.
In order to take advantage of the latest improvements Sprint has made to the phone's ability to receive and utilize signal efficiently, updating to the latest ROM is not enough.
There is a special component outside of the ROM itself called the Radio Baseband, which ROM developers don't include (for whatever reason) into the custom ROM images, and instead sometimes provide as a separate update.