Agree. There is no need (usually) to reverse ailerons. Someone messed up the control horn locations if it is the case.

You should also check the tail mounted split controls before investing in a reversing dual servo harness for the empennage servos on models so designed. I have a GP Ultimate that needed a reverser for one elevator servo, but the similar size Giant Sportster has the mounting holes offset on either side so a reverser isn't needed (after I had ordered one I find this). Oh well, I'll use it eventually.

I also really like the Smart Fly Equalizer II that will mate two servos and can optionally reverse one. It gives about 8 or 10x more precise adjustments to mate the travel. Costs $40, but can save a lot of hassle and frustration when putting two servos on a single control surface or precisely matching things like split elevators.