I have used a Futaba 9C + TM8, a Futaba 14SG and a Futaba 12FG + TM14 - all with FrSky TFR-series receivers. In all, I think I used a single 4-channel receiver and two/three 7-channel receivers
In addition and orthogonally to the question, I have used 8-channel Orange receivers.
The experience has been positive. I have suffered only a single Rx failure in nigh five year. The failure was with a TFR6 receiver which lost channel 1. I am NOT completely certain whether it was the Rx's fault or mine (i.e. not plugging the leads fully and correctly).
Now to your second question - I have questions of my own:
When you say "כלי בנזין" do you mean glow fuel or petrol?
If you mean petrol, one suspects that the plane is dear and near to your heart. This being the case, I will articulate my own policy in using FrSky (and Orange) receivers - planes that are either expensive or important or beloved - get original Futaba receivers. Planes I care little about - get FrSky receivers.