Many of these are supported by other brands, on the higher end radios. But having them together in one radio at the 10channel level is good ( as in the Airtronics one).  Also, there is a way to store models online (outside the radio).

One negative about Airtronics is that the trainer works only with the same model, not earlier models.

SANWA/AIRTRONIC as a radio company is in the market for more than

Also they have won more world championship both cars & air put together than any other radio manufacturer.

As a company its nearly a half century old and has been sell radio for more than 4 decades.

This just a small information so people are well aware of the brand.

Sanwa started to sell under the Airtronics brand from 1982 in the US.

Airtronics are working on the same is what i have been informed.

I knew some smart ass will say this.    That is why I wrote "I have listed the features that I found attractive for this class of radio."  You don't usually see these in a sub $500 radio.

The mixing is supposed to be very flexible too unlike most radios. I don't have full details so I had left that out.

And I forgot one. All 10 channels are fully proportional. Unlike........................Futaba

Another basic question :

Is there  any appreciable difference in speed between 2.4 g and Mhz . I mean the time lag for the servos to react in air to a command from the Tx.

I know Anwar will be happy with this question thought I will do him a good deed early in the morning 

Futaba claims that the lag in their Ghz is half the lag in Mhz. Ghz is short waves and hence travel fast (they claim) However, the lag is so negligible that for a normal person, it is not very evident and cannot be measured as an indication of significant difference.

But technically speaking, yes. Ghz is faster than conventional Mhz

Amen to that !  This whole lag thing is kind of difficult to even notice for 98% of the fliers.  Unless you are doing things like "crack" movements in heli flying, you will hardly notice anything.

But people do talk a little about this thing called a "connected feeling" while flying.  That is significantly influenced by the "resolution" of the connection (for example, 1024PCM versus 2048 PCM).  And you need really good digital servos.

And there are many other issues also, that plays into this "lag" thing.  For example, the Futaba 9C radios (which was like the choice radio for a large percentage of users, until recently), is sort of "known" (not sure by who) for its "lag" in CCPM mixing.  I flew one for over a year, and never felt a thing.  Only when I switched to a more recent radio, I felt a little something, even that is again so minor a difference for my current level of flying.

In short, this whole "lag" thing is probably not worth discussing.

GHz does not travel faster than MHz. I guess we have all long forgotten school physics.

GHz transmitters use a higher bandwidth than 72MHz (3-5kHz BW). So they are able to send information in a much shorter duration. That is why the servos react faster. Whether the difference is perceivable is another matter. This is similar to you downloading through a dial up connection vs broadband. You have higher bandwidth in broadband, so you get the file sooner.