I have 3 of the Multiplex Cockpit MMS in my “stash”. Two of them I bought about 8 years ago, almost new. My intention at the time was to fly one, use the other as a backup for my other, original Cockpit that I had since 2000. It has been thru hell, as it was my RC combat radio, and in the course of a match it would get exhaust blown on it, sticky substances stuck to it (we would coat the wings to help grab and break streamers) and I know it was dropped more than once. I converted it from the stock 6 cell pack to a 2 cell li-ion pack, and when I quit flying rc combat, I used it for some of my old timers. It sat, unused for a few years as my attention turned to rc boating, and a few years ago I converted it to 2.4 using a Frysky internal DHT or “hack” module. I still have it as a backup to my Taranis, and it still works. The DHT module was designed to allow people who have older radios with no external RF module to be able to convert their existing transmitters internally. Unfortunately, FrSky discontinued the DHT module, but it now looks as if they have a replacement on the way, an XHT module, that works the same way, just updated with a “smart port” feature that I’ll never use. However, it means that people with older transmitters can upgrade to 2.4 again, however once that’s accomplished, that radio will only be able to use recievers that will work with FrSky’s ACCST protocol.