ORIGINAL: rcflip
you will not notice the effect of lag in a dual servo system, I doubt opjose would as well...
Sorry but it is VERY noticable and affects things like waterfalls, etc. else I would not have brought it up.
Matchboxes or the MSA 10 are reliable devices, far less likely to fail than the person operating the TX and screwing up a mix.
I started experimenting with syncronizers, matchboxes and other solutions, because both my Funtana and my Giant U-Can-Do displayed noticible lag between the channels.
Inexpensive in line sync devices often recommended here, such as Tower's ESM reverser, made the problem worst as only one channel is conditioned on these cheapies.
Switching to a 2.4gHz 9503 TX helped a lot due to it's automatic serialization of linked channels, but on the Funtana I went with a reversed / normal servo pair, and on the U-Can-Do I went with TWO matchboxes. One Matchbox for the elevators and another to handle the flaps, to get them to sync to the ailerons while still being able to switch them into "flap" mode.
Both of these work very well with absolutely no differences or lag in the control surfaces.
If you have yours set up on different channels try moving the elevator to an extreme, then take it 75% of the way in the other direction and quickly blip it back almost to max the other way. Watch the plane from the tail. The lag is very easy to see and quite unnerving when you realize how much it can occur performing quick moves ( as in 3D manouvers ).