I'm using a flysky Fs-i6 now.
I also use a planet T7 and honestly, I'm finding the flysky to be a meteoric upgrade. It has memory for a number of models (wheras the T7 has none) and it is very easy to reverse channels, much moreso than the planets, because the channel numbers are listed on screen AND on your receiver).
The system also has limited telemetry capability, so the screen shows you TX voltage, RX voltage and also %error in the signal, which essentially warns that you're going out of range. On the water today I got to 200m before the signal error suddenly started jumping from more than 1% (although it does climb very quickly when it does!).
Also, the aerial is moulded in and therefore is essentially indestructible, which is a massive bonus if you don't have a dedicated case for your TX. I was forever knocking the end of my planet off.
It's pretty cheap at around £50 from most places and new RX's are about a tenner. I'll be picking up a few spares while they're still around so I can run my whole fleet off of it.