I used a servo reverser in a 1/4 scale Extra with split elevators and had no issues, and it was the cheap one I was talking about. I no longer need them because I have a 9CAP, which has the ability to trim both with the trim switch. I don't like the idea of trimming in flight and only one elevator half moving with the trim. I've done it before, and it can be okay, but it's far from ideal. Also, when you mess with the sub-trims, you change how the servo moves throughout the range of motion, and your servos may not be well synched as a result. You don't want to change the end points in the radio if you can avoid it. If they're not moving the same distance, your linkage is not set up equally on both servos. There have been some recent articles in some of the R/C mags where they discuss the ways these features can help and hinder in different applications. For throttle, retracts, and other functions not related to control surfaces, those are great features. For control surfaces, you don't want to use them if you can avoid it.

Now, you have different points of view to look at and make your decision, Jonathan. That's what the forums are all about... =)

Crash080 - your issue sounds like a thrust alignment problem. You can try some shims under the left side of the motor mount, just very small ones, and see if that helps. Also, check to make sure that when your rudder is neutral that it is completely centered when looking at it from the rear. I've found that to be a problem in the past that can cause that issue, even when it didn't seem to affect anything else about the flying performance.

-Pat