The Jeti has accelerometers, hall effect sensors on the sticks, an impressive telemetry setup, machined from solid aluminum blank, and you can even record your girlfriends (or anybodies) voice to set for the alarm. This means you can tilt the radio one way and it will automatically give a voice read out of set conditions. Also there is not an internal drag on the sticks, the hall effect senses stick position via a non contact magnet whereas the potentiometers used on almost all other radios contacts each axis.
I plan on upgrading to a Jeti system someday when I no longer like the 8FGS. But for me the Futaba system is working flawless.
Here are some likes I have for the Futaba T8FGS over the Spectrum Dx6i I had. Obliviously this is not an apple to apple comparison like T8 to Dx8 would be. I wanted a radio that could be used far down the road and the 14 channels was a huge selling point. I like the Ipod like sensor the T8FGS uses for menu navigation. I love the fact that even with a critically low battery I have never ever lost signal or had a brown out. I like the sbus one wire hookup. I like being able to adjust the stick tension and length. I like the layout of the switches and the ability to assign each switch within the menu. I like the fact that I have put this radio through a variety of harsh conditions, got it wet, dropped it, pulled off my desk while hooked up to the simulator, dropped a damaged flight battery on it, it has turned over the timer (99:99hrs) at least 4 times, and the only way to tell it isn't brand new is one broken 3position switch. I also dig that one receiver is all you need, and the receivers are as bulletproof as the radio, I used the receiver that came with the Tx until I bought the two Synergy birds I have. The receiver included with it had been crashed at least 10 times, I broke the case in two 4 times in which I glued it back together, the antennas had been bent 180 degrees, glued to the frame, and melted, and honestly I would still trust it to fly any bird I have still.
The one thing I don't appreciate has been mentioned previously and that is it doesn't work with the BNF models like the 130X. Oh and the battery (1800mah NiMh) did not give the duration (2-4hrs) I wanted or the discharge curve, it is possible to use a 2s lipo (I am using a 2500mah good for 6hrs at 7.4v and above), but doing so will void the warranty and can be dangerous (the wall charger is not for lipo and will start a fire if used). In which case I would not reccomend anybody use any battery other than the one that came with it.